AMAZONIANA XIV (3/4): 177-212 Kiel, Dezember 1997 Water mites from stagnant waters of Paraguay* by Beatriz E. Rosso de Ferradás & Klaus Böttger Dr. Beatriz E. Rosso de Ferradás, CONICET, Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Avda. Vélez Sársfield 299, 5000 Córdoba, Argentina. Prof. Dr. Klaus Böttger, Zoologisches Institut der Universität, Olshausenstr. 40 (Biolo- giezentrum), D - 24098 Kiel. Germany. (Acccpted fìrr publication: February, 1997). Abstract Near to the Paraguayan town Concepción water nritcs were sampled in one shallow l¿rke and four ponds. so-called Ta.jamarcs. These waters ¿rrc characterized briefly in thcir abiotic aspects. Thc six net catches hacl as a result 29 species out of l3 gencra ancl 5 fanlilies. Six specics arc new to science. Just a single species is found in 7 out of l3 gcnera. The genus Kocnikeo is the one with the largest spccies nurnber, namely 7. Only a lcw spccies show grcatcr abundances. Many species have rrrarkedly inferior abundances: of I 0 species only a singlc individual could be caught. Not a single species occurred in all fivc waters. Keywords: Watcr mitcs, Hydrachnidia, stagnant waters, Paraguây. Resumo Acaros aquáticos foram colctaclos elr um lago razo e em quatro pequenos brejos, chamados 'Tajama- rcs', perto da cidade de Concepción, no Paraguay. Estes corpos d'água sâo brevemente caracterizados em seus aspectos abióticos. Nas 6 coletas com redc foram encontradas 29 espécies de I 3 géneros e 5 famílias difcrcntes. Seis das espócies são novas para a ciôncia. Em 7 dos I 3 géneros foram encontrados apenas unìa espóoic. O gónero Koenikcu tem o rrraior númcro de espécies. ou seja 7. Somente algumas poucas espócies derronstrarn urna abundância maior. Muitas espócies têm urnâ abundância bern menor: em l0 cspécies apenas ulr único indivíduo foi coletado. Nehuma espécie ocorreu ern totlos os cinco corpos d'água. *ln rlemoriam Dr. Dr. h.c. Kurt O. Viets. 2638ó Wilhelmshaven. Germany ISSN 00(15-6755/199711771 (c) MPI für Limnologie. AC Tropenökologic, Plön¡ INPA. Manaus t77 lntroduction ponds, so-called 'Tajamares' , are of natural kind, but were deepened by man in order to serve the cattle of the surrounding pastureland with water even in times of drought. During his first collecting trip to Paraguay the coauthor sampled altogether 3l According to residents these our ponds belonging to the 'Estancia Ybú' have not species of Hydrachnidia, out of I I farnilies and l6 genera (VIETS & BÖTTGER 198ó). drained for l0 years. Espccially the aquatic macrophytes and an abundant ichthyofauna From the middle of Septernber to the end of October l9tì5 the coautlror took a second indicate a permanent water yield (BRINKMANN & BÖTTGER 1990), trip to Paraguay. This time water mites were exclusively sampled in a well-restricted Hydrachnidia were caught by means of sweeping nets (rnesh size 250 ¡rm) and area near to Concepción. The five waters chosen are one shallow lake and four ponds, picked alive. As usual they were preserved in a solution of glycerol, acetic acid and so-called'Tajamares'. water ( l0:3:6). The results of samples sirnultaneously taken on Rotifera (KOSTE 198ó) and fishes (BRINKMANN & BÖTTGER 1990) are published already. Observations concerning the vegetation. made by fellow{ravellers of Böttger in the area of Concepción at the same Data about the collection localities time, are published as well (WOLF 1990). The present publication represents a further contribution to the still very incomplete knowledge of the Paraguayan lirnnofauna. The collection localities of the water mite sarnples 'Hy l'-'Hy 6' have already been characterizcd in KOSTE (1936) and BRINKMANN & tsÖTTGER (1990). Moreover, the locality of 'Hy 6' is the sarne as 'Fundoft 4' described by VIETS & BÖTTGER Area examincd and methods (1986). Therefore just sotne very significant data will be givcn herc: Concepción (latitude 23"25'south. longitudc 57"25'west) lies about 200 knr north olthe Paraguayan Collection locality of 'Hy I' and 'Hy 2' capital Asunciirn, directly on thc lefì sitlc of thc Rio Paraguay. Refèring to tonpcraturc antl prccipitation (ldentical to 'Probestelle 2' in KOSTE 1986 and 'Untersuchungsgewässer FS' in conditions the clirnate is specified as subtropic. During thc time olsarnpling in Scptcnrbcr/October 1985 BRINKMANN 8¿ BÖTTGER 1990). Shallow lake south of the Rio Ypanó and I krn the daily amplitudc ofair temperature excecdetl 20 "C (night-tinrc cooling down to l 3 "C. day-tirne heating east of the Estancia Santa Maria. Lake surface about 500 x 1000 m. Without outflow, up to 40'C). The annual precipitation ainount is l5(X)-2000 mm. whereas the distribution over single thus its depth is subjected to strong fluctuations in the course of the year. Minirnum tnonths is very unbalanced (Table I and WOLF I 990): the largest precipitation anrounts arc usually found depth during the cxamined timc interval at the end of the drought period up to 1.5 m. frorn March-May. the smallest tiotn August-October. On the water surface extensive 'floating rneadows'. Water acidic (pH-value 5.8-6.6) and of small lirne content. Conductivity up to 80 pSr,,/crn; alkalinity to 0.7. Water tetnpera- tures (20.5-34.0 "C) and oxygen concentrations (saturation index 22-129 %) reveal big Tab. l: Prccipitation in the years 1982-1985 in tlre examined area near to Concepción (Paraguay) daily fluctuations. Sample 'Hy I' was taken at the northeastern lake shore on Measurements at the Estancia Ybú. 27.09.1985, namely from the 30 crn thick water layer between communities of floating plants and the ground. Additionally several bunches of Setlvinia auriculata were rinsed. The sampling of 'Hy 2' was perfornìed at the southeastern lakc shore, in the transition zone from floating vegetation to a free water-surface. Water depth 0.6 rn. JFMAMJJASONDS Collection locality of 'Hy 3' tI 998832 r6ó85 t9937 226954 43t58 44853 6874 lilól 6It t9ó79 t69t8ì 2r386t 211238 2ló02703 mmmrn MA(NldNen t&ic aBl ÖtoT'PTrGobEeRst e1l9le9 03). 'iPno nKdO 4S0T0E m 1 9s8oóu tahnwde'Kstl eoinf gtehwe äEssstearn cKia IY'ibnú .B SRuIrNfaKce- I 984 t72 30 209 188 26 44 30 77 t2 fì4 32tì 340 1560 mm extent of l5 x l5 m. Water depth up to I m. Aquatic macrophytes (rnainly Nymphoides | 985 43 il9 228 160 t]7 73 t35 l3 36 39 50 129 ll12 mm indica with communities of 4 m in width and Eleochans sp.) form a belt along the shore. In between the macrophytes single aggregations of algae. Compared to the three other Tajamares relatively strong impact by cattle (squashing; conductivity 95 ¡rSro/cm); pH-value 7.9. Sample'Hy 3'was taken on 01.10.1985. Collection locality of 'Hy 4' At Concepción the Rio Ypané, coming from the east, flows into the Rio Paraguay (ldentical to 'Probestelle 4' in KOSTE 1986 and 'Kleingewässer K2' in BRINK- (sketch map, see KOSTE 1986 and WOLF 1990). The waters examined are locared on MANN & BÖTTGER 1990). Tajamar 800 m northeast of the Estancia Ybú. Surface both sides of the Rio Ypané, north in the area of the'Estancia Ybú'(= syn. 'Estancia extent 50 x 60 m. Water depth up to 3 m. The water is walled in with earth. Apart from Los Manantialos') and south in the area of the'Estancia Santa Maria'. The collection precipitation, water from neighbouring springs feeds the pond. lmpact by cattle (squas- localities 'Hy I'and 'Hy 2' (Hy for Hydrachnidia) represent the littoral zones of just the same lake. The collection sites 'Hy 3'-'Hy 6' lie at four different ponds: These hing, eutrophication) is averted by a fence. Conductivity up to 38 ¡rSr,r/cm; pH-value t79 178 6.3. High densities of macropltytes (rnainly Eit'hhornia uzurea\ especially at the north dorsal lengths of the distal segrnents of the first leg: l-leg-4:310; I-leg-5: 370; I-leg-6: and southwest shore. Here are found particularly strong daily fluctuations of the water 340: with switnnting hairs. ternperature. For exarrrple, in the rmorning (8.00arn) of 1.10. 198-5 there wcre measured Material examined: I specirnen from 'Hy 3'. 20.8 'C and in the afternoon (4.00pm) 33.6 'C. Discussion: BERLESE (1888) described this species and RIBAGA (1903) redes- For sanrple'Hy 4' Eichhornia-comrnunities as well as the neighbouring free water cribed and illustrated E.tlai.s protenderrs, though, without defining some tnorphological were exarnined on 0l . 10. 1985. aspects. But the ocular plate and the palp of the present specirnen agree well with those illustrated by RIBAGA. Collection locality of 'Hy 5' (ldentical to'Probestelle 5'in KOSTE 198ó and'Kleingewässer K 3'in BRINK- MANN & BÖTTGER 1990). Tajamar 1000 nr north of the Esrancia Ybú. Surface exrenr Family Hydrodromidae VIETS 50 x 70 rn. water depth in excess of 2 rn. This water is also fed by springs. The irnpact by cattle is srnall (conductivity in 2 runs 37-56 ¡rSr,,/crn); pH-value ó.9-8.0. Only weak Genus Hydrodroma KOCH developrnent of macrophyles (Nvmphoitles indicu in srnall nurnbers; sporadically Altogether two species and one subspecies are known frotn Paraguay (VIETS 1987) Cyperaceae-corntrrunities) at the steep shores. On 12. 10. 1985 sampling in free water as and the following species is one of them. well as in comtnunities of N¡,mpþoides inclica. Hydrodroma peregrina peregrinø (KOENIKE 1905) Collection locality of 'Hy 6' See VIETS (1987) for the synonymy of this species. (ldentical to'Probestelle 6'in KosrE 1986,'Fundoft4'in vtETS & BöTTGER This species has been reported frotn Paraguay, Brazil, Argentina and Mexico, and 1986 and'Kleingewässer K4'in BRINKMANN & BöTTGER 1990). Tajarnar300 rn it is very vadable (COOK 1980). south of the Estancia Ybú. Surface extent 20 x 20 m. Watcr depth up to 0.g rn. Again Material exarnined: I fernale fiorn'Hy l'; 16 females and I male froln'Hy 3';3 the pond is fed by spring water and therefore perennial despite of its small size. The females frorn 'Hy 4'; 2 fernales frorn 'Hy 5'. water surface is covered nearly cornpletely by plants with floating leaves (see Fig. 3 in VIETS & BÖTTGER 1986). The irnpact by cattle is srrrall. Conducrivity in 2 runs 30- 52 ptS,,,/crn; pH-value 5.8-6.2. Sarnple'Hy 6'was taken on 13.10. 1985. Family Anisitsiellidae VIETS M ø m e rs e I I ides v entriperforøtøs L UN D BLAD I 93 7 Taxonomy See VIETS (1987) for the synonymy of this widely distributed neotropical species. Material examined: 8 females and I male from 'Hy l'. All the specirnens studied are terìrporarily deposited in thc Zoological Museurn of 'Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Argentina'. Measurelnents of all the specinrens are given in lnicrometer (¡-un); those of Family Limnesiidae THOR the holotype and allotype are given first; if there are other specirnens, their treasure- Inents will be in parenthesis. Genus Limnesìø KOCH l6 species of this genus are known from Paraguay (VIETS & BÖTTGER 1986; vrETS 1987). Family Eylaidae LEACH Límnesia (Limnesia) lsets STOLL 1887 Genus Eylais LATREILLE Lintne.sia laeta STOLL 1887. In: Godman & Salvin, Biologia Centrali-Americana, Three species of the genus Er,lalr are known from paraguay (VIETS & BöTTGER Zoologia 59: 14; Limnesia inaequipalpis LUNDBLAD 1930. Zool. Bidr. 13: 24; 198ó; VIETS le87). Limne,sia laeta YIETS 1954a. Arch. Hydrobiol. 49: 49: Limnesiq (Limnesia) laeta Evlais protenrlen,s (BERLESE I 888) COOK 1980. Mern. Amer. Ent. Inst. 3l: 83. E.vlais exÍenden.\ protendenç BERLESE 1888. Bull. Soc. Entom. ital.20:49: Male: Length of body 580; length between anterior end of the first coxae and . Eylai,s protendens RIBAGA 1903. Ann. Scuola super Agricol. 5: 9; VIETS & posterior end of the fourth coxae 325; width between lateral margins of fourth coxae BÖTTGER I986. Stud. Neotrop. Fauna Environ. 2l: l0g. 460; first pairof coxae fused medially; genital fìeld 132 in length, 185 in width; three only a part of a specirnen was found; the ocularplate 160 in rength, 230in width; pairs of acetabula with the same space between them (Fig. l); gonopore not small; a ocular bridge short and wide; anterior coxal group 553 in widest rneasurement; dorsal pair of small and irregulate platelets posterior to genital field (Fig. l); dorsal lengths of lengths of the palpal segrnents: P.l:79 P-ll: 134; p-lll: l4l; p-lV: 259:p-y: broken; the palpal segments: P-l:21; P-ll: 107; P-lll: 56; P-lV: ll7; P-V: 4l; chelicera:234; 180 t8t with srnall spinifonn seta at distal end of P-lV and a bulge in the rniddle of ventral side Límnesiø (Allolimnesia) polyporø VIETS 1936 in this segrnent; P-ll with a ventral tubercle bearing a peg-like seta and the dorsal side Limnesia (Alblintnesia) polypora VIETS 1936. Zool. Anz. ll3(9-10): 210; LUND- several pilose setae of different size; Fig. 2 illustrates the palpal morphology; dorsal BLAD 1941. Svensk. Vetenskapsakad. Handlingl9(7): LUNDBLAD 1953. Ark. Zool. lengths of the distal segments of the fìrst leg: l-leg-4: 95; l-leg-5: 107; l-leg-6: lll; 5(8): 490; VIETS 1954a. Arch. Hydrobiol. 49(l-2):61. dorsal lengths of the distal segrnents of the fourth leg: lV-leg-4: I40; IV-leg-S: 160; lV- Male: Length of body 617-719, width 575-632; dorsum with a posterior pair of leg-6:152;' seta at tip of lV-leg-6: ll5; IV-leg-5 with five swimming hairs. platelets of .irregular shape; length between anterior end of first coxae and posterior end Material examined: I male .from 'Hy l'. of fourth coxae 415-436; width between lateral margins of fourth coxae 500-533; first Discussion: The only specirnen found in Paraguay agrees well with the descriptions coxae fused medially and posterior apodemes of anterior coxal group short; Glandula by LUNDBLAD 1= L. inuequipaþls LUNDBLAD 1930), VIETS (1954a) and COOK Limnesiae located on the third coxae (Fig. 6); medial seta of the third coxae located (1980) and shows the same difference in the genital field compared with the northem between the glandula and the medial margin; genital field 231-256 in length, 237-266 populations noted by the latter author. This species has been reported ffôln the North of in width; genital acetabula of different size, one pair in the anterior group (but some Argentina (LUNDBLAD 1930), Amazonas (Brazil, VIETS 1954a). Guarernala (STOLL specimens with two acetabula on only one side) bigger than the others; posterior group 1887) and Mexico (COOK 1930). of acetabula vary in number and size; the nurnber of acetabula on each side are: 6-6;7- l; 5-7: 8-8; 7-6; 6-5; 8-6; 5-6; sometirnes two acetabula are fused; Figs. 6 and 9 Li m nesiø ( Limnesiø) løtìgenitølis LUN DBLA D I 937 illustrate these variations; dorsal lengths of the palpal segments: P-l:25-28; P-ll: 155- Limncsiu (Limnesia) latigenitalis LUNDBLAD 1937. Zool. Anz. ll8(l-2): 250; 163; P-lll: 130-136; P-lY:214-227; P-V: 56-62;ventral side of P-ll with a long tuber- LUNDBLAD 1941. Svensk. Vetenskapsakad. Handling l9(7): l3l;LUNDBLAD t953. cle and a peg-like seta and the dorsal side with nine or ten short pilose setae (Fig. 5); Ark. Zool. 5(8): 489. This species has been described and redescribed by LUNDBLAD; chelicera 320-361 in length; dorsal lengths of the distal segments of the first leg: l-leg- it was known from the South of Brazíl and Paraguay. 4:145-169; I-leg-5: 166-189; I-leg-6: 127-136: dorsal lengths of the segments of the Material examined: I female frorn 'Hy 3'. fourth leg: IV-leg-3: I l9-136; IV-leg-3: 138-160; IV-leg-4: 201-222; IV-leg-5: 226-251: IV-leg-6; 203-251; subtenninal seta at tip of lV-leg-6:224-273; IV-leg-4 with two to Limnesiø (Limnesiellø) duricoris (LUNDBLAD 1937) f-our swimming hairs; IV-leg-S with five to seven swirnming hairs; IV-leg-6 with three Limnesia (Neolimnesia) duricoria LUNDBLAD 1937 . Zool. Anz. 120(t t-12): 283: to five short pilose setae on ventral side (Fig. 7). L. (Limne.siella) duricoria LUNDBLAD 1941. Svensk. vetenskapsakad. Handling l9(7): Female: Length of body 810-887. width 920-953; length between anterior end of the 142; LUNDBLAD 1953. Ark. Zool. 5(8): 489. first coxae and posterior end of fourth coxae 458-582; width between lateral rnargins of Male: Length of body 351; dorsal shield 300 in length, 222 in width: containing five fourth coxae 644-779; fourth coxae separated medially; posterior apodernes of anterior pairs of glandularia; length between anterior end of first coxae and posterior end of coxal group short; Glandula Limnesiae as described for the rnale; genital f1aps23l-264 fourth coxae 218; width between lateral margins of fourth coxae275 first coxae fused in length; 153-198 in width; genital acetabula of different size and four to six pairs in medially; Glandula Limnesiae located rnedially in a bifurcation between third and founh the posterior group (the variations were'.4-4:4-5:5-4:5-5; 5-6; 6-5) (Fig. 8); most of coxae, genital field 109 in length,87 in width: genital acetabula in three groups on each these fernales were ovigerous; dorsal lengths of the palpal segrnents; P-l: 29-33; P-ll: side: anterior group with two acetabula, middlc group with two and posterior group with 206-218; P-lll: 144-15l; P-lV: 325-354: P-Y: 12-82; chaetotaxy as for the rnale; five or six acetabula (Fig. a); gonopore 57 in length; P-ll with a bulky, peg-like seta on chelicera 363-380 in length; dorsal lengths of the distal segments of the first leg: I-leg- ventral side and five short and pilose setae on dorsal side: (Fig.3 shows the chaeto- 4:156-185; I-leg-5: 177-197; I-leg-6: 164-185; dorsal lengths ofthe segments ofthe taxy); dorsal lengths of the palpal segments: P-l: l2;P-Il:72: P-lll:37; p-lV:60; p-V: fourth leg: IV-leg-2: 144-148; IV-leg-3: 160-69; IV-leg-4: 234-243; IV-leg-S: 271-288; 25; chelicera 138: dorsal lengths of the distal segments of the first ls,g l-leg- : 62; IV-leg-6: 243-264; IV-leg-6 with subtenninal seta: 325-370: IV-leg-4 with two to four I-leg-5: 7l; I-leg-6: 82;dorsal lengths of the distal segmenrs of the fourth leg: lv-leg-4: swimming hairs; IV-leg-S with six to seven swimming hairs; lV-leg-6 ventral side with 78; IV-leg-S: 87; lV-leg-6: I0l; subtenninal seta of lV-leg-6: 9l; IV-leg-4 with rwo three to five short, pilose setae. swimming hairs, IV-leg-5 with one swimming hair. Material exalnined: I female from 'Hy 2':24 nales and I ll females from 'Hy 3'; Material examined: I male from 'Hy 4'. 3 females from 'Hy 4'. Discussion: The Paraguay specimen agrees well with L. duricoria from the South of Discussion: The present specimens agree fairly well with the description and redes- Brazil. However, the palp of the specimen from Paraguay reveals that the pilose setae cription by VIETS (1936, 1954a), although there are some differences in the genital and the 'peg-like' seta are bigger. The genital field contains, concerning the posterior field of both; VIETS' specimens have more numerous and smaller acetabula than the group of acetabula, ll or l2 acetabula and a smaller gonopore, referring to LUND- Paraguayan specimens but this population is variable (see the measurernents and BLAD's drawing. This is a new finding for Paraguay's fauna. figures). On the other hand, the Paraguayan population of L. polypora agrees well with Limnesia (Allolimnesia) angustipalpis LUNDBLAD 1938 (from Southem Brazil and Paraguay) with some exceptions: a long tubercle on ventral side of P-ll and its number of setae. VIETS (1954a) made a table of differences between both l. polypora VIETS t82 183 and L. angustipalpis LUNDBLAD, but some of this aspects considered are untenable. 202); palp as described for the rnale; dorsal lengths of the distal segments of the third The Paraguayan specimens of this study are somewhat intennediate between the charac- leg: III-leg-4: 155 (154-159); III-leg-5: 188 (185-21ó); Ill-leg-6: 137 (135-l5l); III-leg- ters given for both species. 4 with eight swimrning hairs; IIl-leg-5 with eleven swirnrning hairs; Fig. l3 illustrates the proportions and chaetotaxy of lll-leg-5 and 6; dorsal lengths of the distal segments Genus Centrolimnesra LUNDBLAD of the fourth leg: IV-leg-4: l6l (160-163); IV-leg-5: 188 (192-195); IV-leg-6: l9l (189- This neotropical genus contains eight species, of which four are found in Paraguay l9l); IV-leg-4 and 5 with eight swimrning hairs (Fig. l4). In tlris study two species of Centrolimnesia are mentioned. Holotype: Adult male frorn 'Hy 5'. Allotype: Adult fernale frorn 'Hy 5'. Centrolimnesiø schødei LUNDBLAD 1938 Material examined: 3 gravid females frorn 'Hy 5'. Centrolimne.çia schadei LUNDBLAD 1938. Zool. Anz. 122: 9; LUNDBLAD 1941. Discussion: There are two species most closely related fo C. guarani n. sp.: C. vietsi Svensk. Vetenskapsakad. Handling l9(7\: 164; LUNDBLAD 1953. Ark. Zool. 5(8): LUNDBLAD l94l (from Paraguay) and C. mota.sr COOK 1980 (frorn Mexico). Howe- 486; VIETS 1954b. Schweiz. Zeilschr. Hydrologie l6(l): ll9; VIETS & BÖTTGER ver, the new species differs in structure and chaetotaxy of the third and fourth legs of 1986. Stud. Neotrop. Fauna Environ.2l(l-2): lll. These specimens from Paraguay the nrale; in C. guarani the hairs of lll-leg-S are longer and more numerous and bear agree well with the type material of LUNDBLAD from Brazil and Paraguay (1938, two 'spatulate bipectinate' setae at the distal end; II|-leg-ó of C. guarani n. sp. rnale has l94l); the specimens taken by VIETS (1954b) in Amazonas (Brazil) exhibit slight several curved, short and heavy setae which are longer at the distal end and a pair of differences in lneasurements, their body, for instance, is larger. 'spatulate bipectinate' setae at the distoventral side (see Fig. I I ); thesc are very di- Material examined:22nales and 58 females from'Hy 3'and'Hy 4'. stirrctive diagnostic characters for C. guarani n. sp. Centrolimnesiø guørøni new species Male: Length of body 789, width 628; dorsum with a pair of irregular and small Family Unionicolidae OUDEMANS platelets at posteriorend,69 in length and l6 in widtht length between anteriorend of the first coxae and posterior end of the fourth coxae 562; width between lateral margins Genus Uttiotticola HALDEMAN of the fourth coxae 570; medial margins of the first coxae long; Glandula Limnesiae In Paraguay about ten species of the genus Unionicola have previously been recor- located anteromedially on fourth coxae; genital held l8l in length and 142 in width; ded; U. /ìssipalpis is one of thern. gonopore occupying much more than half the area of genital field; nurnerous thin and Unionicola (Pentatax) /i,ssipalpis LUNDBLAD 1942, Unionicola (Pentatax) /is,si¡tal- long setae along the edge of genital field; three pairs of irregularly shaped acetabula; pis LUNDBLAD 1942. Svensk. Vetenskapsakad. Handling 20(2): I l9; VIETS 1954a. Fig. l0 illustrates the structure of ventral side; dorsal side of palp with numerous pilose Arch. Hydrobiol. 49( l-2): 85t VIETS 1954b. Schweiz. Zeitschr. Hydrologie l6( l): 128; setae and ventral side of P-ll bulk with small peg-like setae; dorsal lengths of the palpal VIETS & BÖTTGER 1986. Stud. Neotrop. Fauna Environ.2l(l-2): ll2. segments: P-l: 14; P-ll: 56; P-llI: 62; P-lV: 87; P-V: 30; chelicera 198 in length; The present study agrees well with the description by LUNDBLAD and the more capitulurn 165 in length; structure of palp illustrated in Fig. l6; dorsal lengths of the recent paper of VIETS & BÖTTGER (1986). distal segments of the first leg: I-leg-4: 142;l-leg-5: I57; I-leg-6: 130; I-leg-4 and 5 Material examined: I male from 'Hy 4'; I rnale from 'Hy 5'. with nurnerous pilose and long setae; dorsal lengths of the distal segments of the third leg; IIl-leg-3: 148; III-leg-4 177: III-leg-5: 251; lll-leg-6: 164: IIl-leg-3 wirh four Genus Neumøniø LEBERT swirnming hairs; Ill-leg-4 with eight swimming hairs and numerous pilose, long setae; Six species of the genus Neumania have been known ftorn Paraguay, one of them lll-leg-5 with six swimrning hairs and numerous long, pilose hairs on ventral side; is N. polvrric'lrø LUNDBLAD 1938. dorsodistal end of this segtnent projecting farbeyond the insertion of the sixth segment; III-leg-6 with a curved line of short, heavy setae which are much longer at the dorsal Neumønis (Tetrøneu maniø) polytric hø LUN DBLAD I 938 distal end; the margin of ventral distal end of III-leg-6 in Fig. I l; dorsal lengths of the Neumania polytricha LUNDBLAD 1938. Zool. Anz. 122: 12; N. (Tetraneumania) distal segments of fourth leg: IV-leg-3: 230; IV-leg-4:193 lV-leg-5:218; IV-leg-6: polytricha LUNDBLAD 1942. Svensk. Vetenskapsakad. Handling20(2): 160; VIETS 317; IV-leg-3 with five swirnming hairs; IV-leg-4 and 5 with seven swimming hairs; 1954b. Schweiz. Zeitschr. Hydrologie l6(l-2): 135. IV-leg-6 curved and with numerous small setae (Fig. l2). Male: Body 563 in length, 430 in width; dorsal shield 238 in length, 288 in width; Female: length of body 743 (760-772), width 536 (520-540); dorsum with a pair of length between anterior end ofthe first coxae and posterior end ofthe fourth coxae 432; srnall platelets medially fused or not; length between anterior end of the first coxae and gonopore 82 in length; dorsal lengths ofthe palpal segments: P-l: 29 P-ll:93; P-lll: 52; posterior end of fourth coxae 504 (520-529); genital field I 64 (162-173) in length; I 52 P-lV: 97; P-Y:32: chelicera 130 in length; dorsal lengths of the distal segmenrs of rhe ( 148- 154) in width; acetabula small and with few thin hairs (Fig. l5); ovigerous females first leg: I-leg-4: 185; I-leg-5: 173;l-leg-6:214; dorsal lengths of the distalsegmenrs of witheggsof 144 diarneter; dorsal lengthsofthepalpal segments:p-l: l7(15-19);p-ll: the second leg: Il-leg-4: l8l; Il-leg-5: l8l;ll-leg-6:243; dorsal lengths of the distal 60 (62-68); P-III: 54 (53-58); P-lV: 89 (90-96); P-Y:23 (22-24); chelicera: 196 (194- segments of the third leg: III-leg-4: 156; III-leg-5: 177; Ill-leg-6: 189; dorsal lengths of 184 185 the distal segments of the fourth leg: lV-leg-4: 159; lV-leg-S: 196; IV-leg-6: 170; IV- first coxae and posterior end of the fourth coxae 27 l-274; width between lateral apophy- leg-4 with five swimming hairs; lV-leg-5 with seven swimrning hairs. ses of the fourth coxae 325-331; width of the genital field 325; gonopore flaps 136 in Material examined: I male from 'Hy 4'. length, 107 in width; dorsal lengths of the palpal segments: P-l:23; P-ll:68-70; P-lll: Discussion: The specimen agrees well with the description and redescription by 3l; P-lV: 58-60; P-V: 33-34; palpal chaetotaxy as described for the male; dorsal lengths LUNDBLAD (1938, 1942) and is only included in here for the sake of completeness. of the distal segments of the first leg: I-leg-4: 78-79; l-leg-S: 93-94: I-leg-6: 85-87; dorsal lengths of distal segments of the fourth leg: IV-leg-4: ll7-ll9; IV-leg-5: 134- Genus Koenikeø WOLCOTT 138; IV-leg-6: ll3-ll5; I-leg-5 and lV-leg-4 with two swimming hairs; lV-leg-5 with LUNDBLAD ( 1943a) published approxirnately 30 species and subspecies of Koeni- three swimlning hairs. kea from Paraguay and VIETS & BÖTTGER (198ó) added infonnarion abour four Material examined: I male and I female frorn 'Hy 2'; 4 females and I male from species. In the present studies there are found two new species. For some furlher species 'Hy 4'; I female frorn 'Hy 5' and 3 females frorn 'Hy 6'. of Koenikea there are given some morphological variations. Discussion: LUNDBLAD described this species from the South of Paraguay. The present specimens agree well with the description by LUNDBLAD except for palpal Koenìkea (Koenikeø) trìanguløris LUNDBLAD 1938 chaetotaxy. Refering to this characteristic it is more closely related to K. acutq dentata Koenikea triangularis LUNDBLAD 1938. Zool. Anz. 122: 13; Koenikea (s. str.) VIETS 1975 (described by VIETS from Arnazonas, Brazil). triangularis LUNDBLAD I 943a. Svensk. Vetenskapsakad. Handling 20(5): 122. Female: Body 549-644 in length, 520-644 in width; dorsal and ventral shields Koenikeø (Koenikeø) paraguayensis new species present; dorsal shield 479-553 in length, 450-512 in width; arrangement of the dorsal Male: Body 624 (603-617) in length, 671 (644-677) in width; dorsal and ventral glandularia slightly different from male in LUNDBLAD's maps (1943a) (glandularia 5 shields present; dorsal furrow complete; dorsal shield 570 (430-553) in length; 599 are located far posterolaterally to the third pair); Fig. l8 illustrates the dorsal shield; (404-620) in width; dorsurn with six pairs of glandularia and the color pattern as shown length between anterior end of the first coxae and posterior end of the fourth coxae in Fig. 20; body larger and postolaterally angular (see Fig. 20); length frorn anterior end 275-347: width between lateral margins of fourth coxae 341-368; genital field 337-351 of the first coxae to posterior end of the fourth coxae 417 (321-413); width between in width; genital flaps 124-149 in length, 86-lll in width; dorsal lengths of the palpal lateral margins of fourth coxae 392 (304-392): posterior apodernes of arrterior coxal segrnents: P-l: 28-29; P-ll: 62-82; P-III: 33-41; P-lV: 58-77; P-V: 35-37; capitulum 103- groups short; acetabular region 308 (292-308) in width; gonopore 84 (87-88) in length, I l6 in length;chelicera lll-125 in length;palpal segments with several relatively long 3l (29-38) in width; 45-50 (40-48) genital acetabula on each side; FiB.2l shows the and pilose setae (Fig. l7); dorsal lengths of the distal segments of the first leg: I-leg-4: structure of the venter; excretory pore subterminal; capitulurn with srnall rostrum and l; 80-l I I-leg-S: 91-126: I-leg-6: 82-109; dorsal lengths of the distal segmenrs of the 135 (139) in length; dorsal lengths ofthe palpal segments: P-l: 3l (31); P-ll: 104 (97- fourth leg: IV-leg-4: 124-142l' IV-leg-5: 138-l7l; IV-leg-6: 124-150: III-leg-4 and 5 106); P-lll: 52 (53-55); P-lV: 107 (103-107); P-V: 52 (50-53); peg-like seta of P-lV with three swimming hairs'each; IV-leg-4 with five or six swimming hairs; IV-leg-5 stubby and inserted distoventrally; ventral surfaces of P-ll and P-lll I'ugose; Fig. 24 with three or four swimming hairs. shows a palp; dorsal lengths of the distal segments of the first leg: l-leg-4: 166 (152); Material examined: 3 females from 'Hy l'; I female from 'Hy 2'; 60 fernales from I-leg-S: 166 ( 154); I-leg-6: 144 (146): with few and short 'rillborsten' on l-leg-4 and 5; 'Hy 3'; I female from 'Hy 5'. dorsal lengths of the distal segments of the third leg: III-leg-4: 105; Ill-leg-S: 166; III- leg-6:144; dorsal lengths of the distal segments of the fourth leg: IV-leg-4: 160 (152); Koenìkes (Koenikeø) øcuts acutø LUNDBLAD 1943 IV-leg-5: 222 (218): IV-leg-6: l8l (185); distoventral side of lV-leg-4 with six swim- Kr¡enikea (s. str.) acutq LUNDBLAD 1943a. Svensk. Vetenskapsakad. Handling ming hairs and palmate seta; IV-leg-5 ventral side with a series of long and short, 20(5): 124. thickened, pilose setae and six (five) swimming hairs; IV-leg-6 with four (five) short, Male: Dorsal and ventral shields present; dorsal furrow complete; dorsal shield 407- pilose, truncate hairs (Fig. 22). 4 I 3 in length , 407 -416 in width; length between anterior end of first coxae and posterior Female: Length of body 768 (768-785), width 785 (710-814); dorsal and ventral end of fourth coxae 261-272: width between lateral margins of fourth coxae 317-321; shields present; dorsal furrow complete; dorsal shield 694 (702-7 19) in length,66 I acetabular field 310 in width; gonopore 82 in length;45-50 genital acetabula on each (6ll-140) in width; the pigment patches on the dorsal shield bigger than in the male side;dorsal lengths of the palpal segrnents: P-l:23-31; P-ll: 64-65; P-lll:31;p-lV: 58- (Fig. 23); outline oval, not angular and wider than in the male; length from anterior end 62: P-Y:33; palp with several long setae illustrated in Fig. 19; dorsal lengths of the of the first coxae to posterior end of the fourth coxae 44ó (443-458); width between distal segments of the first leg: l-leg-4: 82-83; I-leg-S:99-l0l;l-leg-6: 93-94;l-leg-6 lateral margins of the fourth coxae 458 (456-479); genital field 384 (381-388) in width; with a long thin seta; dorsal lengths of the distal segments of the fourth leg: lv-leg-4: genital flaps 124 (124-127) in length and 124 (124-126) in width; aproximately 50 107-l12; IV-leg-5: 124-125; IV-leg-6: I l3-ll4; I-leg-5 wirh two swimming hairs; IV- genital acetabula (48-51) on each side; dorsal lengths ofthe palpal segments: P-l: 38 leg-4 with four to five swimming hairs; IV-leg-5 with eight to ren swimming hairs. (31-39); P-ll: I I I (106-l l3); P-III: 66 (56-64); P-lV: 120 (l l3-l l5); P-V: 54 (a9-58); Female: Length of body 549-578, width 504-549; dorsal and ventral shields present; proportions and chaetotaxy of the palp are similar to the male; capitulum 136 (134-152) dorsal shield 483-549 in length, 446-479 in width; length between anterior end of the in length; dorsal lengths of the distal segments of the first leg: l-leg-4: 188 (189-192); r86 187 l-leg-5: 169 (165-172); l-leg-6: 144 (136-142); with a few 'rillborsten' on l-leg-4 and IV: 66 (62-70): P-V: 52 (49-56); capitulum 103 (105-ll3) in length; structure of palp, 5; dorsal lengths of the distal segments of the fourth leg: IV-leg-4: l9l (189-195); IV- chelicera and capitulurn as described for the male; dorsal lengths of the distal seglnents leg-S: 241 (243-250); lV-leg-6: 212 (210-214); chaetotaxy as in the male, except that ofthe first leg: l-leg-4: 105 (93-l l3); I-leg-5: 122 (l19-130); l-leg-6: 120 (ll3-122): IV-leg-6 has longer pilose hairs. chaetotaxy as in the male; dorsal lengths of the distal segments of the fourth leg: IV- Holotype: Adult rnale frorn 'Hy 3'. leg-4: 146 (142-159): IV-leg-5: 167 (160-l8l); IV-leg-6: 134 (124-146): IV-leg-4 with Allotype: Adult female frorn 'Hy 3'. five swim¡ning hairs; lV-leg-5 with three swirnrrring hairs and two snraller ones; the Material exarnined: 2 females from 'Hy l'; 2 fernales frorn 'Hy 2'; 2 males and I other hairs as in the male. female from 'Hy 3'; I rnale frorn 'Hy 4'; 2 females frorn 'Fly 6'. Holotype: Adult malc from 'Hy 6'. Discussion: Concerning the wider and posterolaterally angular shape of the body the Allotype: Adult fernale frorn 'Hy 6'. male of K. (Koenikea) paraguayensis n. sp. seerns most closely related to K. (K.) Material examined: I female frorn'Hy l'; I female from'Hy 3'; 6 females from bicornis LUNDBLAD l94l (from Paraguay); K. (K.).falcaria VIETS 1977 (from 'Hy 5'; 19 fernales frorn 'Hy 6'. Brazil); K. (Notomideop.sis) spinosa DADAY 1905 (from Paraguay and Brazil) and K. Discussion: There are three species of Koenikeu with enlarged apophyses on the (Notomideop.sis) toloma COOK 1980 (from Mexico). The new species differs in the posterior shield: K. rutae LUNDBLAD (frorn south of Brazil); K. siolii VIETS (from posterior apodemes of the anterior coxal groups, in the anangement of the glandularia Amazonas) and K. u¡n,simili.ç VIETS (florn Arnazonas). The new species, however, in the dorsal shield and in the genital field extending farther to the posterior margin of bears a single and unusual pair of posterolateral 'horn-like'projections with five glandu- the ventral shield. Furthennore K. toloma bears enlarged claws in the lV-leg-6 and a laria, by which it can be easily distinguished. Furthermore K. rutqe, K. siolii and K. spatulate seta in the ventral surface, K. .falcaria has a strongly modified lV-leg-6, not cottsintilis bear more than one pair of apophyses. found in the new species. K. paraguave¡l.r¡¡ has a color pattern which is very different from the four Inentioned species. The female of the new species is very similar to the Koenikeø (Notomideopsis) spinosa DADAY 1905 female of K. quinquemaculata LUNDBLAD 1943a (frorn Paraguay) and K. sexmaculata See VIETS (1987) for the synonymy of this species. COOK 1980 (from Mexico); however, the best characteristics to distinguish K. para- The specirnens redescribed and illustrated frorn Brazil by LUNDBLAD (1943a) and guayensis are the color pattern and the genital field. frorn Paraguay by VIETS & BÖTTGER ( 1986) agree with the specirnens reporled here. Material exalnined: 2 fernales from'Hy 2';2 fernales frorn'Hy 3'; l7 fernales and Koenikea (Koenikeø) retrocornufa new species 3 males from 'Hy 5'; I female ftom 'Hy 6'. Male: Body 529 in length, 492 in width; dorsal and ventral shields present; dorsal furrow cornplete; dorsal shield 492 in length,42l in width; a pair of posterolated horn- Koenikea (Notomideopsis) elegans LUNDBLAD 1938; Koenikeø elegans like projections with 'enlarged glandularia' located in their base; the other pairs of LUNDBLAD 1938. Zool. Anz. 122: l2; K. (s. str.) elegans LUNDBLAD 1943a. glandularia on the tubercles (Fig. 25); length frorn anterior end of the first coxae to Svensk. Vetenskapsakad. Handling 20(5):921' K. (Notomideopsis) eleganç COOK 1980. posterior end of fourth coxae 304; width between lateral apophyses of fourth coxae 321; Mem. Amer. Ent. lnst. 3l:206. posterior apodemes of anterior coxal groups short; gonopore 95 in length; genital field Male: Length of body 135-752: width 793-841; dorsal and ventral shields present; 25 I in width;23 acetabula on each side and a moderately enlarged glandularia, illustra- dorsal furrow complete; dorsal shield 617-691 in length; 669-618 in width; glandularia ted in Fig. 26; excretory pore subterrninal; dorsal lengths of the palpal seglnents: P-l: on the dorsal shield as shown in Fig. 3 l; length between anterior end of first coxae and 24, P-ll: 76; P-lll: 4l; P-lV: 62; P-Y:37; capitulurn lll in length; chelicera I l3 in posterior end of the fourth coxae 545-560: width between lateral rnargins of fourth length; peg-like seta on P-lV located at the ventral distal end; capitulum with short coxae 587-ó0 l; posterior apodemes of anterior coxal group extencling posteriorly to the rostrum (Fig. 27); dorsal lengths of the distal segrnents of the first leg: l-leg-4: 83; suture line between the third and foufth coxae; genital field 493-5 I2 in width;30-40 I-leg-5; 102; I-leg-6: ll3; l-leg-6 with numerous setae (Fig. 30); dorsal lengths of the genital acetabula on each side; gonopore 107-lll in length; 4l-45 in width; excretory distal segments of the fourth leg: IV-leg-4: 126; IV-leg-5: 150; IV-leg-6:149; IV-leg-4 pore tenninal; dorsal lengths of the palpal segments; P-l: 30-3 l; P-ll; 107-ll0; P-lll: with three swimming hairs; IV-leg-5 with three swimrning hairs and pilose hairs on the 72-74:P-lY: 124-126;P-Y:47-49: palpal setae pilose, Fig.33 illustrates a lateral view ventral side of both segments as shown in Fig. 28. of the palp; capitulum 144 in length; dorsal lengths of the distal segments of the first Female: Body 587 (566-628) in length,578 (560-601) in width; dorsal and ventral leg: I-leg-4: 210-302; I-leg-5:222;I-leg-6:230-231 l-leg-2-3-4 and 5 with'rillborsren' shields present, dorsal furrow complete;dorsal shield 537 (518-562) in length, 475 (459- of different size (Fig. 32); dorsal lengths of the distal segrnents of the fourth leg: IV- 500) in width; dorsal glandularia similar to that of the rnale but without any horn-like leg-4: 210-2ll: IV-leg-5: 263-265; IV-leg-6: 201-204: IV-leg-4 with six or eight projections; length from anterior end of the first coxae to posterior end of fourth coxae swimming hairs; IV-leg-5 with four swimming hairs. 323 (314-352); width between lateral apophyses of fourth coxae 354 (349-378); poste- Female: Length of body 816-884, width 876-879; dorsal and ventral shields present; rior apodemes of anterior coxal groups short; gonopore flaps 132 (127-152) in length; dorsal furrow complete; dorsal shield 818-822 in length, 760-762 in width; length genital field 304 (306-321) in width; t9-21 acetabula on each side (Fig.29); dorsal between anterior end of first coxae and posterior end of fourth coxae 587-590; width lengths of the palpal segments: P-l 3l (28-37 ); P-ll: 100 (96- 106); P-III: 43 (41-47); p- between lateral margins of fourth coxae 636-654; genital field 504-5 l3 in width; genital t88 t89 flaps 140-150 in length and 124-128 in width; eight females with numerous eggs of 58 in length and 42 in width; 24-26 genital acetabula each side; excretory pore sub- 128-132 of diameter;dorsal lengths of palpalsegments; P-l: 35-37;P-ll: 107-l l3; P-lll: terminal(Fig.38);dorsal lengths of the palpal segments: P-l: 2l;P-ll: 56; P-lll:33; P- 70-74:P-lY: I I l-120; P-Y:47-49: palpalchaetotaxy as in the male; capitulum 134-139 lY:62;P-Y:21: chelicera 93 in length; several tubercles with setae on ventral side of in length; dorsal lengths of the distal segments of the first leg: I-leg-4: 216-226: l-leg-5: P-lV (Fig. 37); dorsal lengths of the segrnents of the first leg: l-leg-4: 120; I-leg-S: I l3l 199-201; l-leg-6: 198-20ó; with 'rillborsten' on segments l-leg-2 to 5; dorsal lengths of I-leg-ó: ll3; first leg with numerous 'rillborsten'(Fig. 39); dorsal lengths of the the distal segments of the fourth leg: IV-leg-4: 226-230: IV-leg-S: 267-273: IV-leg-6: segments of the fourth leg: IV-leg-4: l2ó; lV-leg-S 142: IV-lcg-6: ll3; all segments 243-249: IV-leg-5 with 7 or I swimming hairs. with numerous short, pilose hairs getting longer on distal segrnents; lV-leg-S with four Material examined: 4 males and 8 fernales from 'Hy 2'l2 females frorn"Hy 4'. swimming hairs. Discussion: These specimens agree well with the material of LUNDBLAD from Material examined: I fernale from 'Hy 2'. Southern Paraguay. Some additional measurements and the morphology of the body are given here. Recifellø ( Eorecifella) unduløts (LUNDBLAD I 936) Koenikea (Koenikea) undulata LUNDBLAD 1936.Zool. Anz. ll6: 201: K. (s. str.) Koenikes (Diplokoenikeø) curvirostris WALTER l9l9 undulata LUNDBLAD 1943a. Svensk. Vetenskapsakad. Handling 20(5): 89:' Recifella Koenikea curvirostt'is. WALTER 1919. Rev. Suisse Zool. 27:451, Koenikea.flagellata (Eorecifella) undulata COOK 1980. Mem. Amer. Ent. Inst.3l:201. LUNDBLAD 1938. Zool. A.nz. 122 14: Koenikea (Diplokoenikea) curviro.st"is LUND- Fetnale: Dorsal and ventral shields present; dorsal furrow complete; dorsal shield BLAD 1943a, Svensk. Vetenskapsakad. Handling 20(5):45. 477 inlength; 388 in width; three pairs of glandularia present on dorsal shield, of which Female: Length of body 537, width 553; dorsal shield 496 in length, 454 in width the most anterior lie on tubercles; length between anterior end of first coxae and (Fig. 34); length between anterior end of first coxae and posterior end of fourth coxae posterior end of fourth coxae 390 and 397 in width between lateral fourth coxae; genital 300; width between lateral margins of fourth coxae 356; genital field 354 in width; acetabula free and more than 50; gonopore terminal and 142 in length and l0l in width; genital flaps 132 in length,70 in width; approximately 30 genital acetabula on each dorsal lengths of the palpal segments: P-l: 27: P-ll: 93; P-lll: 43; P-lV: 72: P-Y: 29: side; with several eggs of 192 diarneter; dorsal lengths of the palpal segments: P-l: 3l; ventral side of P-ll and P-lll with very small denticles, Fig. 40 illustrates the mor- P-ll:77: P-lll:37; P-lV: 75; P-V:43;capitulum lll in length (Fie.35); dorsal lengths phology and chaetotaxy ofthe palp; dorsal lengths ofthe distal segrnents ofthe first leg: of the distal segments of the first leg: I-leg-4: 124; l-leg-S: 140; I-leg-6: 124; dorsal I-leg-4: 1241'l-leg-S:126:l-leg-6: ll5; I-leg-4 and 5 with several 'rillborsten'(Fig.4l); lengths of the distal segments of the third leg: III-leg-4: 109; lll-leg-5: 155; Ill-leg-6: dorsal lengths of the distal segments of the fourth leg: lV-leg-4: 99; IV-leg-S: 97; IV- 140; dorsal lengths of the distal segments of the fourth leg: lV-leg-4: 140; IV-leg-S: leg-6: 105; lV-leg-4 with four or five swimming hairs; lV-leg-S with three swimming 183; IV-leg-6: 148; IV-leg-4 with five swimming hairs; IV-leg-5 with three swimming hairs. hairs (Fig. 36). Material examined: I female from 'Hy I'. Material examined: I female from 'Hy 3'. Discussion: The present specirnens have small denticles and more pilose hairs on P- Discussion: The present species agrees well with LUNDBLAD's material; some new Il and P-lll than in LUNDBLAD's diagnosis, but otherwise they are similar. morphological details and measurements are given for this species. Genus Recifellø (VIETS) Family Pionidae KOCH Recifella was described as a subgenus of Koenikea: COOK (1980) elevated it to genus. Several Koenikea species were transferred to Recifellø. In Paraguay there are Genus Piona KOCH about 12 species and subspecies of this genus; two of them are found in this study. Seven species of Piona have been known from Paraguay to date (LUNDBLAD 1943b; VIETS & BÖTTGER 1986); in the present pap€r a new species is described: Recifellø (Eorecífellø) excavstq (LUNDBLAD I 936) Piona davidkoofri n. sp.; Piona de.formi.ç LUNDBLAD l94l is mentioned for the first Koenikea excavata LUNDBLAD 1936. Zool. Anz. 116:. 16; K. (Koenikea) excavata time from Paraguay. LUNDBLAD 1943a. Svensk. Vetenskapsakad. Handling 20(5): 88; Recifella (Eoreciþl- la) excavata COOK 1980. Mem. Amer. Ent. Inst. 3l: 201. Píona deþrmis LUNDBLAD l94l Female: Length of body 463, width 413; dorsal and ventral shields present; dorsal Piona deþrm¿s LUNDBLAD 1941. Ent. Tidskr.62:124:1941. Svensk. Vetens- furrow complete; dorsal shield 413 in length,380 in width; subcuticular lines are very kapsakad. Handling 20(8): l0; SMITH 1976. Can. Ent. 108: 994. noticeable by extending laterally between glandularia; three pairs of glandularia present Male: Body with a very particular shape; Figs. 42 and 43 illustrate a dorsal and on dorsal shield; Fig. 36 illustrates the dorsal shield; length between anterior end of the lateral view; length of body 454-471, width 355-363; with a pair of dorsal platelets: 39 first coxae and posterior end of fourth coxae 267;width between lateral tips of fourth in length and 27 in width; anterior coxal groups separated medially; tips of first coxae coxae 314; posterior apodemes ofanterior coxal groups extending near to the suture extending beyond the capitulum; suture lines between third and fourth coxae medially lines between third and fourth coxae 267 : acetabular plates 247 in width gonopore flaps incomplete; third and fou¡th coxae fused medially but not complete; length between r90 l9l anterior end of the first coxae and posterior end of fourth coxae 408-440; width between the structure of lV-leg-4; IV-leg-5 with four swirnming hairs. lateral tips of fourth coxae 412-473; genital field fused with the fourth coxae and Female: Length between anterior end of first coxae and posterior end of fourth coxae extending as far as posterior corners ofthese; gonopore lying in a slight depression, and 958; width between lateral rnargins of fourth coxae l3l2; all coxal groups separated; excretory pore attached to the genital field, as shown in Fig. 44; gonopore 287 in posterior lines of fourth coxae slightly projecting; suture lines between third and fourth length, l0 in width; l5-17 genital acetabula on each side; capitulum 156 in length; coxae ending slightly before medial margins; Fig. 50 illustrates the ventral sclerites; dorsal lengths of the palpal segments: P-l: 3l; P-ll: 144-175; P-lll: 72-91; P-lV: pregenital sclerite between posteromedial margins of fourth coxae; length between 134-173: P-V: 39-52; P-lV with a very srnall peg-like seta; Fig. 47 illustrates the margins of pre- and postgenital sclerites 330; width of genital field 694; more than 30 proportions and chaetotaxy of the palp; dorsal lengths of the distal segments of the first genital acetabula; acetabular plate more than two acetabula in width; several acetabula leg: I-leg-4: 72-75:l-leg-5: 185-187; I-leg-6: 156-160; l-leg-6 with many small setae; free; P-lV with tubercles but smaller than in the male; dorsal lengths of the palpal dorsal lengths of the distal segments of the third leg: II|-leg-4: 189-192: lllJeg-S: 226- segments: P-l:29; P-ll: l7l;P-lll: 72;P-lY:163; P-V: 49; dorsal lengths of the distal 231; III-leg-6:99-100; long claw of third leg with a short and wide clawlet shown in segrnents of the first leg: I-leg-4: 206; I-leg-5: 218; I-leg-6: 189; dorsal lengths of the Fig.48; dorsal lengths of the distal segments of the fourth leg: IV-leg-4: 189-214:lY- distal segments of the third leg: lll-leg-5: 234;llI-leg-6: 185; dorsal lengths of the distal leg-S 201-277; IV-leg-6: 123-173; IV-leg-4 as shown in Fig. 45; IV-leg-5 with four segments of the fourth leg: IV-leg-4:222; IY-leg-S:2591' IV-leg-6: 194; III-leg-5 with swimrning hairs; IV-leg-4 with three swimming hairs. twelve swimming hairs; IV-leg-4 with five swimming hairs; female with several eggs Female: Length of body 6ll-644, width 504-537; pair of dorsal platelets, 49 in of approxitnately 220 in diarneter. length, l9 in width; length between anterior end of the first coxae and posterior end of Holotype: Adult male frorn 'Hy 2'. fourth coxae 363; width 677: all coxal groups separated; posterior corners of fourth Allotype: Adult female frorn 'Hy 2'. coxae moderately projecting; suture lines between third and fourth coxae incomplete; Discussion: The present species resembles: Piona.iuncta LUNDBLAD 1936 (des- acetabular plates complete but several acetabula free; nrore than 30 acetabula on each cribed from southern Brazil); P.juncta inconspic'ua LUNDBLAD 1943b (known frotn side; length between pre- and postgenital sclerites 169; acetabular plate 218 in width; Paraguay); P. robustipalpis VIETS 1954a (from north of Brazil\ and P. junc.tella COOK Fig. 46 illustrates the venter; dorsal lengths of the palpal segments: P-l: 27: P-ll: 1980 (described from specirnens of Costa Rica), however, the ¡nale of the new species 124-127:P-lll:62-65; P-lV: 124-l3l; P-V: 37-39; lengths of the distal segments of the differs in several ways from all of thern. One of the differences concerns the propor- first leg: I-leg-4: 123; I-leg-S: 144;l-leg-6 152; lengths of the distal segments of the tions ofthe spertnathophore transferring claw ofthe third leg; other differences are: the fourth leg: IV-leg-4: 180; IV-leg-S: 193; lV-leg-6: 189; IV-leg-S with three swimming genital fìeld fused medially with the fourtlr coxae; rnore than 30 acetabula of different hairs. size on each side; small gonopore; excretory pore fused with genital field; ventral side Material examined: 2 males and 2 females from 'Hy 2';2 females from'Hy 4'. of P-lV with large tubercles and numerous setae. Discussion: Previously Piona deformls was known from Río Grande do Sul, Brazil; so this is a new record to Paraguay. The specimens agree well with the structure and proportional lengths of the original description; by this study several data is added. Family Mideopsidae KOENIKE Pionø davidcooki new species Genus Mídeopsís NEUMAN Male: Body 1942 in length, 1042 in width; length between anterior end of first Six species of Mideopsis are known from Paraguay. M. :;ic,a is new for the Para- coxae and posterior end of fourth coxae 950; width between lateral margins of fourth guayan water mites fauna. coxae 1024 anterior coxal groups separated medially; third and fourth coxae fused medially; Fig. 49 shows a ventral view; suture lines between third and fourth coxae Mideopsis (Neoxystonotus) sicø LUNDBLAD 1943 fused medially; posterior margins of fourth coxae not projecting; genital field extending Mideopsis (Neoxystonotus) sica LUNDBLAD 1943b. Svensk. Vetenskapsakad. laterally to posterior projection of fourth coxae; gonopore 82 in length and 29 in width; Handling 20(8): 130. two epimeroglandularia in genital gield; more than 30 acetabula of different sizes on Female: Length of body 594-604, width 570-580; dorsal shield 5 12-522 in length, each side; excretory pore attached to genital ¡eld; Fig. 5 I illustrates the genital field; 47 l-485 in width; dorsal shield with O-shaped, pore-free area, color pattern with green ejaculatory complex is shown in Fig. 52; ventral side of P-lV with a pair of well areas, one anterior spot and 2 pairs of lateral patches (Fig. 56); length between anterior developed tubercles bearing numerous different setae; dorsal lengths of the palpal end of first coxae to posterior end of fourth coxae 399-409: width between lateral segments; P-l:70; P-ll:329: P-lll: 185; P-lV: 354; P-V:99; Fig.54 shows the chaeto- margins of fourth coxae 370-382;gonopore length 123-127; width 86-88; dorsal lengths taxy and proportions of the palp; chelicera 292 in length; dorsal lengths of the distal of the palpal segments: P-l: 3l-33; P-ll: 52-57: P-lll: 25-27, P-lV: 64-69; P-Y 27-29: segments of the third leg: III-leg-4:446;lll-leg-5:438; Ill-leg-6: 190; III-leg-4 with Fig.58 illustrates the structure of the palp; capitulum 93-100 in length; dorsal lengths eleven swimming hairs; dorsal distal end of III-leg-6 enlarged; long claw of third leg of the distalsegments of the first leg: I-leg-4: 78-82; I-leg-5; 103-109; l-leg-6: 95-100; with a very long clawlet, Fig.53 illustrates III-leg-5 and 6; dorsal lengths of the distal dorsal lengths of the distal segments of the second leg: Il-leg-4:87-89; Il-leg-S: l0l- segments of the fourth leg: IV-leg-4:430; IV-leg-S;538; Vl-leg-6: 426;Fig.55 shows 103; Il-leg-6:93-96; dorsal lengths of the distal segments of the third leg: III-leg-4: t92 r93 103-105; IIl-leg-5: 130-134; Ill-leg-6: I l3-l l6; dorsal lengths ofthe distal segments of previously unknown female. At last two new species, Arrenurus (Megaluracarus) the fourth leg: IV-leg-4: ll5-122; IV-leg-5: 127-132: IV-leg-6: 134-140; IV-leg-4 with hachmanni n. sp. and Arrenurus (Megaluracarus) funnelifttrme n. sp. are described. six swimrning hairs; IV-leg-S with seven swimming hairs (Fig. 57). Material examined: 2 females from 'Hy 4'. Arren urus (M egaluracørus) gladiifer¿.r LUNDBLAD I 94 I Discussion; The present specimens agree well with the description by LUNDBLAD Arrenurus (Megaluracarus) gladiifer'¿.ç LUNDBLAD 1941. Ent. Tidskr. 62(l-2): (1943b) frorn Brazil; the morphological characteristics, the color pattern and the measu- 126; LUNDBLAD 1944. Svensk. Vetenskapsakad. Handling 20(13): 59. rements yet unknown are included. Female: Dorsal and ventral shields present; dorsal furrow cornplete; length of body 789, width 677; dorsal shield 642 in length. 580 in width; color pattem of the dorsum with three dark green patches; length between anterior end of fìrst coxae and posterior Family Arrenuridae THOR end of fourth coxae 421 (438): width between lateral tips of fourth coxae 66 I (68 l); acetabular plate region 148 (165) in length, 413 (436) in widthl Fig. 59 illustrates a Genus Amenurus DUGÈS ventralview;dorsal lengths of the palpalsegments: P-l:27 (29); P-ll:68 (70); P-lll: 37 (38); P-lV: 64 (61): P-V: 34 (37); Fig. 60 illustrates the chaetotaxy of the palp; dorsal Arrenurus (Dudøyeilu) (KOENIKE 1907) lengths of the distal segments of the first [eg: I-leg-4: 120 (129); I-leg-5: 130 (138); I- Six species belonging to this subgenus have been collected in Paraguay, among leg-6:126 (132); dorsal lengths of the distal segments of the fourth leg: IV-leg-4: l6l which are Arrenuru.s (Dadayella) rotunda (DADAY 1905) and A. (Dadayella ?) nanus (170); IV-leg-5: 17l (179); IV-leg-6:165 (173); IV-leg-4 with six swirnnring hairs in (VIETS 1954a) (CRAMER & COOK 1992b). the distal end; lV-leg-5 with seven swimming hairs. Material examined: 4 fernales frorn 'Hy l'; three of them ovigerous. Arrenurus (Dødøyella) rotunda (DADAY 1905) Discussion: The palp of the females agree very well with the palp of the male with See VIETS (1987) forthe involved synonymy; CRAMER & COOK 1992b. Int. J. the characteristic patch of many'blade-of-cutlass-like' setae in P-ll. Acarol. l8(3): 221. Material examined: l3 females from 'Hy l'. Arrenurus (Megølurøcaras) bøchmanni new species Discussion: These specimens agree well with the redescription by VIETS (1954a) Male: Body 1354 in length, 781 in width; cauda 615 in length, at the posterior end and Rosso DE FERRADÁS (rSSr). 385 in width; cauda long and widening to the posterior end and concave in the rniddle; cauda dorsally with a round hump (dorsal and lateral view in Figs. 6l and 64); anterior Arrenurus (Dadøyella ?) nønus (VIETS 1954a) end of the body slightly projecting; dorsal portion of ventral shield with two anterior Arrenurus (Truncaturus) nanusYIETS 1954a. Arch. Hydrobiol. 49(l-2):189; 1954b. pairs of humps and a pair of posterolateral projections; dorsal furrow complete and Schweiz. Zeitschr. Hydrologie l6(l): 208; ROSSO DE FERRADÁS lSAl. Rev. Soc. passing ventrally at the base of cauda irnrnediately posterior to the genital field; length Ent. Argentina 40(l-2): 194: A. (Dada¡tella ?) nanus CRAMER & COOK 1992b. lnt. between anterior end of the first coxae and posterior end of fourth coxae 653; width J. Acarol. l8(3):221. between lateral tips of the fourth coxae 818; length of the gonopore 58 (ventral view in Material exa¡nined: 2 rnales frorn 'Hy 2'. Fig.62);dorsal lengthsofthepalpalsegments: P-l:45; P-ll: 127:P-lll:58;P-lV: ll9; Discussion: These two rnales agree with the specirnens of ROSSO DE FERRADÁS P-V: 58; rnedial surface of P-ll with a large patch of setae of different kinds: 'blade-of- (1981) frorn Argentina in all aspects. cutlass-like'and spatulate; internal surface with several pilose setae; Fig. 65 illustrates the chaetotaxy of palp; capitulum 169 in length; dorsal lengths of thc distal segments of Arren urus (Megaluracaras) the first leg: I-leg-4: l8l; I-leg-5: 212; l-leg-6:259: l-leg-6 covered with large setae The subgenus Aruenuru.s (Megaluracarus) with about 20 species is the second in (Fig. 74); dorsal lengths ofthe distal segrnents ofthe second leg: Il-leg-4: 226:ll-leg-S: species nurnber for water mites in Paraguay; nine species of this subgenus are covered 255; ll-leg-6: 280; Il-leg-4 and 5 with seven swimming hairs; dorsal lengths of the in this study. Four species are already known from Paraguay and had been described distal segments of the third leg: lll-leg-4: 230; Il|-leg-5: 255; lll-leg-6: 243: IIl-leg-4 and redescribed very well because they are the most abundant in the Paraná basin: with eleven swimming hairs; IIl-leg-5 with eight swimrning hairs, dorsal lengths of the Arrenurus (Megaluracarus) epimero.ç¿¿s MARSHALL l9l9; A (M ) triconicus MARS- distal segments of the fourth leg: IV-leg-4: 329. with distal projection 354, and with six HALL l9l9; A. (M.) cornifi'o,n.r LUNDBLAD 1938 and A. (M.) crenicaudata LUND- swimming hairs at the tip; IV-leg-S: 308, with three rows of swirnming hairs with l0- BLAD 1938 (ROSSO DE FERRADÁS tSS¿). For two other species this study reveals l5-10 hairs, respectively; IV-leg-6: 4ll, distal end slightly curved (Fig.63). new records for Paraguay: A. (M.) cataglyphus and A. (M.) .fuhrmanni; these species Female: Body 1187 in length, ll04 in width; dorsal and ventral shields present; have been described and illustrated elsewhere (ROSSO DE FERRADÁS tOS+, tOSe¡. dorsal furrow complete; dorsal shield 792 in length, 6l 5 in width; anterior margin of the For this reason they are not included here and because they are also very frequent in the body as in the male; with two pairs of projections on lateral margin (Fig. 69 illustrates extent of the Paraná basin. The seventh species is A. (M.) gladiiferus LUNDBLAD, the structure of the dorsal view); length between anterior end of the first coxae and which is already known from Paraguay; here is included the first description of the posterior end of the fourth coxae 567 (537); width between lateral tips of fourth coxae t94 195