CERORtBATLlLA GEN. NOV.. FOYORIUATULA GEN. NOV. AND FOVORIBATlil.lNAE SF. NOV. (ACARIDA: CRVPTOSTIGMATA; ORfBATULIDAK) FROM SOUTH AUSTRALIAN SOILS D. C, LEE&C. M. BIRCHBY r HE D, C. & BIRCHBY. C. M., 1991. Ceroribalulu gen, nov.. f'ovoribahda gen. nov. and Fovorihaiulinac $t nov. (Aearida: CryptostJgmata: Oribatulidae) from South Australian soils. tec. % jfaftf. Mus. 24(2): 71-89 Ceroributuia gen. nov. (including (wo species-complexes) and FovorihaluUi gen. nov. are established, with seven new species as follows: Cemrihatula mcrusrora-cotuplts, C. incrustufa (type-species), C bizvgata, C. monozynatat C. trimstrata; C mt>gaJ'orurrtmu-wnvW*t C. meguforamina; f-'ovoribututuhrewsemsa(type-species), P, mesosetosa. They arc grouped in Ihc F'ovoribarutinae, a new subfamily in the Onbatulidae, wiih lour oiher genera. The new species are from plant liner, moss or soil at die four drier(arid, semi-arid, mallee-broombush, mallee- heath) sties of the nine floralty diverse South Australian sites sampled. Hour specie*, carry a conspicuous cerotegument, which in C. incrustafa formspatchesof(hick wax. The legchaetotaxy of the Oupodoidea is briefly discussed and the absence of setae on femora 1 and II is siven taxonomic significance* There is a key to adults of Australian species of t'ovoribalulinae. D. C. Leeand C M- Birchby, SouthAustralian Museum, NorthTerrace, Adelaide. Soulh Australia 5000. Manuscript received November 1989. I This is a further pan of an ongoing study of Measurements are in micrometres Qtm), The mites sarcoptit'orm rnites in South Australian soils, examined were all collected by one of us (D.C.I..) sampled from nine florally diverse sites, and for and are mainly deposited in the South Australian which an introduction to Ilie relevant work on the Museum (SAMA), but also in the Natural History advanced oribate mites (Planofissurae) has been Museum, London (BMNH), the Field Museum of published (Lee 1987). The mites considered here Natural History, Chicago (FMNH) and the New have been referred to as'seven species ofOrihaiuia- Zealand Arthropod Collection, DSIR, Auckland like miles' in the publication describing (NZAO. Deeoribotuta Ijee & Birchby, J989, They aregrouped here in two new genera. With Rrassirt/a Balogh, 1970, Decoriboiula, Rrtivuloppiu Balogh & Notation and Lto CHAerorAX* Mahunka, 1966 and Romanahaies Fcidcr, Vasifiu & Calugar, 1970, they make up the Fovoribatulinae, The modifications in morphological notation a new subfamily within (heOribaluIidacThor, 1929. presented in papers on Setobatcs(Lee& Pajak 1988) The kovoribatulinac lias a deficient chaetotaxy and Scheloribates (Lee & Pajak m press) are on femora I and II, which is unusual amongst the followed here, but elaborations are made in defining Oripodoidea. This has had some consideration with apodemes and describing »hc integumental & the description of Decoribatula Lee Birchby, sculpturing, whilst the relevant leg chaetotaxy is 1989, but is further commented on here. Also the discussed. sejugal apodemc notation and the terms used to Three iypes of apodemes are associated with the describe sculpturing of the integument are briefly sejugal soma! division: dorsosejugal apodemc ( reconsidered. dorsophragmatie apophysis of Norton 1983); The notum is illustrated for all seven species, but pleurosejugafapodetne ( bolhridial apoderne of the idiosterna are so similar for some pairs of Lee 1987, which merges dorsally with the species that they are only illustrated for four species. integument near the bothndium ofsensory seta ~2); The only complete set of legs illustrated is for ventrosejtigutapodemc( = sejugal apodemcofthe Ceroribatufa inerustala(Fig. 4), where, because of podosternum). Also, two further thickenings in the the variations in leg chaetotaxy> the setaeare drawn podosternal integument, other than apodemes I, II on femora I and II. Some legs are illustrated for and UI associated with thecoxites, are apparent in a further four species, mainly to represent the the largest species(C trirostrata, Tig. 9), midsternat variations in chaetotaxy on femora J and II, but upodetne dorsal to seta ///), and the posipodat also the relative siresofthe tarsi and prctaisal claws. apodeme abaxial to seta 117 (not homologous with aC i.EUAC M, BIRCHBY apudeme IV. which is absent m tftenutes considered ; rassoribatulinae. These are listed, with the most here) deficient i'irst, as follows; li ii characteristic 6f Fovoribatultnae thai the I H2/J«0; II - 0.2/1,0 some Cmtribaiula integument is sculptured and incrusted with a i 0,2/2,0; [I - 0,2/1,0 some Ceroribatula .substantia! and sometimes conspicuous and flelkuloppia eerotegument. The sculpturing often consists of I - 0:2/1.1; II - 0,2/0,1 Brassiella many srnaM pits, each in the centre of a shallow I - 0,2/1,1; II - 0,2/1,1 Fovoribatula and depression. The depression may be circular or. jf Decoribatula bounded by reticulate ridges, hexagonal. The I - 0,2/2,!. II - 0,2/1.1 Romanobaies and reticulate ridges probably consist partly of the Crassoribatula. eeroicgument (the superficial layer of the Thechaetotaxy of Brasstelia and Crassoribatula integument developed by exudation through pores is not given in the literature, but is newly recorded in the cuticle), sincethey art conspicuous and more here after examining the holotypes of Brassiella tar.ed around the patches of Thick wax ou penicillif'er Hammer. 1973 and Crassoribatitla Ccmribatulu incrusiaia (i i^. 3). The thick wax is maculosa Hammer, 1967. Not alt variations are columnar, white and strongly refraelijc, the reflected in the above presentation o\ chaetotaxy, hrxagonal columns growing out at right angles to for example, in Fovoribatula the ventral seta on the integument surface, both in this species and femur I is dtMoventral <v2 - see Fig. 13), whilst in ttrltculoppiu reticulata Balogh & Maiiunka, 1966. Oecoributulu it is proximoventrai (vl - see Ijee & On the other hand, the wa\ may form a thinner Birchby 1989, fig. 2>. Also illustrations sometimes layer, uniformly covering the integument, and suggest a different seta! position because of the sometimes containing Small, retractile wax granules orientation of leg segments, as for femur i of making il either generally dirty white in colour as Ceroribatufa monazy'HQta (Fig. 5h where W appear- on Ceroribatula bizyxata or forming whitepatches lo bein positionp\. Such possibilities forconfusion as on Cerortbuiuta trirostraia and fmohhatuta are greater when the greatest number of setae are tucso^aosa, The irUtroseulptunng varies, the absent compared with the usual complement forthe different stales merging into n continuum, but they Oripodoidea, since the seta present may be located arccateuorved as follows: foveaw, pined; tviicuhte- in an intermediate position between its usual place fowate, pined, with each pit in a hexagonal space and the expected position of the absent seta. In delineafed by rericulate ridges; reticulate, relicuiale previous papers on the PlanVofr&surae by one ofus lines Or ridge.s without pits, alveolate, depressions (s.g. Lee 1987) only a seta has been shown on that may be separated by indistinct reticulation. femur II, in order to indicate its relationship to a The chaetoiaxy of five setae on both femora I ventral flange that is sometimes present; more and II is the same lor mOM members ol the specifically this is seta v2, Oripodoidea- Using only the four major files of setae on a leg segment (see Ixe 1981, fig. 19), this chaetotaxy is represented by the number of setae SYSfl MMICS that are anterior, dorSai/Ventral, posterior and is given as follows: I - 0,2 '2,1; II 0,2/2,1. Sublamily TOVORfBATUIJNAE sf. nov. Exceptionally somesetae arcabsent, either justthe Nomtnoiype genus: Fovoribatula gen. nov posterior seta as in Symbiorihatidae Aoki, 1966 and a lew genera of Oripodidae taeot, 1925. or always Diagnosis the disiovcntral seta (v2) on femur II aiid some Onhatuiidac. Kystcronotum with 14 pairs of otherventral or posienor setae on femora I and II, short, medium length or long setae. Translametla as in Lamellareidae Balogh, 1972, C'rassoribatulinae cither absent, lincatc or costate; if laminar it is Balogh & Balogh, 1984, and the genera grouped confined to the lateral part and not presenl across here in the Fovoribaiulinae sf. nov. The absence of midline Lateral proteronotal foramen (Fitsmall but such setae, at least withinthelattei tsvosubfamihes clearly multiporosc. Sensory seta (zl) clavate with ofOribatulidac,is considered primitive because ihey subglobose caput. Integument usually with art- also absent in the Lteneremacoidea, regarded extensive foveateand/or reticulate sculpturing, often as the most primitive group within the Poronota with substantial eeroLegumem, sometimes forming and a.sistergroup totheOripodoidea. Out itshould thick, while, relraclilc, columnar wax. Anterior be noted that the Galumnoidca. regarded as the masgin of hysleronotum either convex with most derived superfamily within the Poronota, dorsnsejugal furrow curving around lenticulus or always lacks seta i'2 on femur II. truncated with straight dorsoseiugal furrow and no The relevant femoral chaetotaxy in the lenticulus. Femur II with fewer than normal five Orihatulidae ha^ a number of forms when it is setae, at least sera r2 absent (0, 2' I, I). Legs slim, deliucnt as in the Fovoribatulinac and medium length or long, leg IV (femur-tarsus) FOVORIGATULINL MITVS n usually longest sometimes subequal in length to leg Distribution I, The Fovoribatulinae appears to beendemic to the Oriental and Australasian Regions. Within these tivtwral Morphology and Character Stair regionsit has not yet been found in cooler temperate Polarization southern AustraJia and New Zealand, This is based On the basis ol'ihe absence of femoral seiae. boih on few data, but from the South Australian Fovoribatulinaeand Crassoribatulinae areregarded sampling, Cerortbatula and Fovoribatula are as a pnmirive group within the Oiibatulidae (sec represented hy seven species (substantial species sOercitbiaotniiloindae^Noitnattiuornn aisndreLgeagrdCehdacatsotaa;\pyri1)m.itTihvee dhiovleiresritsyi)tesw.hTihceh parreevicoounsfrienceodrdtsoarteheoftBoruarssdireilelr,a from Ceylon, New Guinea, Samoa, New Caledonia tamily within the Oripodoidea because of its and Tonga, Decoribatula from Singapore, muliiporose hysteronotal foramina and a lack of pteromorphs. The Fovoribatulinae is, therefore, Rettculoppia from tropical Queensland and Romanobates from southern koumania. This recognised by the absence of derived character states. TheCrassoribatulinae, which also lacks seta suggests that the relevant faunas ofthe malleeand v2 on femur II. is distinguishable from the and regions arc derived from tropical fmaunas either Fovoribatulinae by three derived character states: as relicts from tertiary tropica) climates the region len pairs of hysieronotal setae, six pairs of genital or as invaders from recent tropical climates to the setae and a midsternal gap in the ventrosejugal north. As viewed here, the most primitive species apodeme. occur in the malice and arid region faunas. The classification established here for genera suggesting that fhey are the relicts within the Fovoribatulinae in based on the premise ofa polarization ofthe increasing number ofsetae Remarks on femur I and H being more derived There are The Fovoribatulinae includes Onbatulid genera considered to be two lineages, a primitive one in (hat have a lack ol certain femoral setae, and which there is no posteiior seta on femur II, compared with the oribatulid Crassoribatulinae including Ceronhatula and Rettculoppia, and a with a similar lack ofsetae, they have fewet genital derived lineage in which this posterior seta is setae, an entire rather than an incomplete piesent. On the basisofthis, thesimilarities between ventrosejugal apodeme and more hysteronntal Reiicutoppia and Decoribatula, although due to setae. These latter three character states they share derived characters (long hysteronotal setae and with Oribatulinae. Ihe Fovoribatulinae are very divided hysteronotaf foramen /3), are convergent. different from the Lamellareidae, which also has The same is true for Ceronhatula mexafomnrina 8 primitive lack ofthe same femoral selac. Without and Fovoribatula mesosetosa. the recognition of the reducedehaetofaxy. members On the basis o\ this polarization, the stares of or a particular fovoribatutine group would be other possibly important characters are polarized included in the Orihatuhnae with species in either as follows. Theseta s\ on trie pmteronotum, seta Oribatula Berlese, 18*35 or Zygoribatula Beriese, v on trochanter I and the hysieronotal setae arc !9U>. There has, therefore, been a considerable regarded as primitive if they are shorter and as reweighling ol the importance of particular derived if they are longer. For the proteronotal characters. The relationships between (he six Hdges, the presence of weakly laminar, complete included genera, as presented here based on the lamellaeor the presenceofoneor two translamcihe femoral chaetoiaw~• !.i.v- rheni in two sister- (as Cerorihatuta bizygata, Fig. 6} is considered to groups: the pr , :* 1 1 Cerortbatula and be primitive, whilst the absence of lamellae and Retieuloppia, and the derived Hra^stetta. translamellae (as Reticuloppia reiiatluta Baiogh & Decoribatula, Favorihattuaand Romatmbotes. On Mahunka, 1966) is considered derived. For the the other hand. CefOtlQUtuiO superficially most Ifi hysteronotum, the presence of a lcmiculus similar to FovoribaluU. associated with a mid-dorsal, forward pointing The nature and posvbK adaptive significanceot protruberancc and an undivided anterior Ihe incrustation pan cr\ be given preliminary multipoiose foramen (/*3) is regarded as primitive, consideration. What *s probably a similar whilst a straight anterior hysieronotal margin with incrusiation is desenhed on the humeral no lcnticulus and a divided anteriot multiporose hvsieronotal region of Ofjpadih fXUdtiffl Truve*. foramen {Fla and F3bf< as for Decoribatula I%l, bur it is a homogeneous wax and not made pustulosa, is derived. For rhc prctarsal claws, up of columns. Wax blooms, although not so lelanvely short \cj, rarsusj claws with slim lateral substantia], have also been described on an Oppia daws (fig. 4, teg II) is regardedasprimitive, whilst species (Brady 1970), The temporary presence of long claws with stout lateral claws (Fig. 12) is wav filaments making an arid region tenebrionid derived. beetle white rather than hlack has been observed M 74 D. C. LEL & C, KIKCMMY asan adaption to control water loss (Louw& Seely 6), Midstcrnal and hysteronotal tntcgumental 19821 1 his possiblerelevance ofwax incrustations .sculpturing reticulate ,C bizygula sp. nov. to waterconservation could be true for RetfeUtoppiQ — 7 Translamella present. Hysteronotal setae short (72 and Ceroribatuta, bul il is also possible that it is length less than 0.5> distance from setal base73) an excretory product. (Wg. 14) Lateral preiarsal clawsdepth more than the following six genera are included in the 0.5 k depth pf central claw (Fig. 12) Fovoribatulinae: Brassiella Ualogh, 1970, — E btvvisetoxa sp. nov. Cervribatutu gen. nov., Decoribittuta Lee & Birchby, Translamella absent. Hysteronotal setae medium I9S4 fovoributula gen. nov,. Rettculoppin Balogh length (,/2 length0.5-1.0> distance from setal base & Mahunka, 1966 and Romanohaie^ Fcidet. Vasiliu 73)(Tig.. 16). Lateralpretarsalclawsdepth lessthan & Oalugar, 1970. A key is provided for the ei^hi 0.5- depth of central clEaw (F$£, 13).,, Australian species included in the subfamily. rrtesasetosa sp. nov. ticnus Cvruribxtifto gen. nov. kl V TO AUMRAI IAN FOVORIBATLLINAL (AOLlLPi) Type-species: Ceronbututu tncruslata sp. nov. 1 — Hysteronotal setae lottgct than distance between their bases. Lamella absent or incomplete, not reaching bothrtdium to setaz2, whichis turret-like fovoribatulinae. Hysteronotal setae short or (height subequal to diameter ot pore). Live pairs medium-length (shorter than distance between their id hvsternnoial multiporose foramina bases). Lcmiculus present, associated with mid- . . . Reticuloppta reticulata UftlOflJl & Mahunka dorsal forward pointing protruberanee of - Hysteronotal setae shorter than distance between hystcronotum. Lamellae present, laminar and tioheshetbaacsie.swhIiacmhelhlaasplreoswenptr*ofrielaec'(luhieiiyghhtinllieissidtihuaont complete (between z\~z2), Translamella present f).5 • diameter ofpore), tour pairs ot hysteronotal (may be second eostaie ridge) or absent. Rim of nndtipnrose foramina. 2 botbridium (base of seta c-) low, not torret-like. - , Lour pairs of hysteronotal multiporose foramina. — 2 I-emora I and II lack posterior setae (Fig. 4). Disctdium present as costatc ridge. Femora I and Pretarsal claws smaller, central cl;nv Ifijfc9 than 0.1.. II without posterior setae usually three setae <0f 2/1, length of tonus 11.. , .Cemribatulu gen. nov., 3 0) but femur I may have four setae (0, 2/2. 0), - trniura 1 and |l with a posterior seta (l*ig 13}, Pretarsal claws short (central claw II less than 0.3x Pretarsal claws larger, central claw gieatei than length of tarsus II). t) I lengdi of tarsus 111 , FfA'onhufutu .ueii nov,, 7 , Remarks — 3 luiiu jiioieiL-'iiotal seiavl (subequal re distance /2 Cerortbarufa is superficially similar to - Z\, fTg 10)and trochanter I seta V (ableto macjj t'ovutibutulu u_tru. \\o\„ but it is regarded as more — seta i-2 on femur \). C. me%uJoramina sp. nov. closely allied to Reticuloppta Lee & Birchby, 1989, Short proieronotal seta a-I (0.6- or less, distance because oftheehaetotaxy on femora ! and LI. The 7*2 - tl, Hg. I) and IfGCfWtUCJ I *\.i i (only able name is derived from the Latin tcerat meaning wax, to reach seta vl on temur I or shorter) A as used in the term 'eerotegument'. The ecrotegument is sometimes particularly conspicuous 4 tcnuir I with seta represent tfit' Jl VransHunclla and comprisescontiguous merged vertical columns - plreemsuenrt torwialbhsoeuntt seta -i£ (I w_ ty, Iransljmct.U5 oRlcnawiai\vpapsiuo),n CTheingterunsutsatuinc(lauldsoesistwpoiesscpnetcieosn- picscut 6 compIc\cs: the incrustata-c.omplex and — 5 TranslanK-IIrt absent Rustium without incisions. rrtexqfora/nina'CamplcK. Hystcronoial foramen f 3 wnh Niittfiiiidinalaxislews lhan 2fe breadth (Fijlv l).c', nurnstata sp. nov Tuiv-I nnc-lla present. ROiUUin divided by I1VQ VrHTiiv/a/3-eomple.\ incision* uitu three points. Mysu'tunoul foramen /l Willi loninludniat n\r^ ritufv Ulflll 3 biLMdlh Diagnosis C (f'iy. B) . trinitrate sp. nov. Ceronbatuta, Hysteronotal setae (shorter than ft — No ridge between proiL-ronoiji WISC-./2 /Z. $f&K 0(.s5ho>rtderistthaancnedbieatmweeteern obfasbeost)h,ripdrioaileraopneorttaulres)eiaan5dl ja2ndandhv?:sllceirloimutire.ajnld Li'nUtfeartnemeilnitr:!!*).sMciudl-psttucrmiantg trochanter I sela v (shorter than distance between loveolatc C mutU'zytttttu sp. nov. Kelac i\ 12) shun. Translamella presenl or absent. Lamella-ttkt ridge present between proieronotat Femue 1 either with (0,2/2,0) or wilhout (0.2 10) •>etac./2-yTSehiey'2and z\ smooth and lotate(I ly. seta vl. 1 ruVORIUATUUNL MIII.S M Remarks I], Two adavial setae on ccwite 1 similar in length t be MtVttftofl-eomptex is regarded as the mote (/I and 11 subequal). Central region with to\cola*e primitive group within Cerorihatula, having some sculpturing similar to that illustrated (Fig, 2) axound species withonly threesetaeon femora I and II and posterior margin of genital orifice, short somal (except for protcronolai setaej\*fi and Opisthosternum with setae nl fairly uniform ::!) and iroehanter 1 selae. It isCdiverse, compiling length* Sa\ subequal to SaJ. Adanal pore Sqfnearly four new species as follow. imrustata (type- longitudinal, further from anal oiifice than "us speeies), C. hizygafa, C. mntiozy%ata C (rirnsfrafa. length. Eggs oval, 170 > 15 (mean or 1 t horizontally aligned eggs, 40% of mean female length), smooth or wrinkled exochoiion. Number Ceraribatiifa incntstxta sp, nov of eggs in female (number of females) as follows: Figs 1-4 four (2), six (2), eight (5). Legs medium-length (mean femur-tarsus: 49% oi Female soma), slim (mean maximum tibial height: 30% ol mean length). Dorsal porose areas and weak- Dorsal profile of bysteronotum subcirculat, eolout dark brown, cerotcgument substantial alveolate abaxial sculpturing, usually with reticulate posteriorly and pleurally around legs, while cerotcgument on all Femora and trochanters 111 and incrustation ofwax always on proteronotum, rarely IV. Only three setae on femur II (0.2/1.0) and four on hysteronotal humeral region (Fig. 3), soincrintes setae on femur I (0,2/1,0). on venter offemora 1 and II, Idiosornal length, 468 (mallee-heath, n - 9, 406-504) and 497 (malice- Male broombush, n - 3, 488-509). leg lengths (femur- As fal female except genital orifice not or only taxsuv for idiosomal length 48S, mallee-heath): I - narrowly abutting onto venirosejugal apodemc. 239. II - 224. Ml - 222, IV - 270. Tibial nmimum White protctonotal incrustation present on l/j pi heights (for 488V 1 - 26, II - 18. Ill - IS, IV - 16, 20 males ex mallee-heath andall 5 males ex mallee- Proieronotuni with weakly lammai lamellae and broombush, Soma smaller, idiosomal length 425 costate sublamellae, translamella absent. Sctaj'2 (malice-heath, n - 20, 398-475) and 429 (malice- shorter (less than 0.75 > ) than rj, both eiliate, and broomhush, n - 5, 416-445). elavale, ccroiegumcrit may increase si/.e of eaput. Dorsolateral aspeet illustration (Fig. 3) represents Material Examined the right seia /2 as shorter due rti [>arallax. Hokuype: v (NI989164). sand, litter, under Conspicuous cerotegiunetit anterior to seta cl is banksia shrubs [Banksia umatu\ Tarnboore undivided (Fig. 3) or may be bilobar, with thelateral Homestead (35"57*S. 140 29' F>, 4.viii.l974. subhexagona! wax columns being longer and Paratvpes: 69 9 (M989I65-NI989169), 16 era a BMNH, curvingoutwards. Posterior to thick ccroicgument, (N1989170-N1989I83); I v, 2 _r - I ?, integument conspicuously reticulatc-fovcale and 2 Or ff - FMNH; 1 9, 2 o* " N/AC, same data nuiv have small vertical tubercles at angles; of as hotorvpe. hexagons, and no incrustation further back where Undesignated: 3 9 9 (NI989IS4-N19891S6). 5 integument fovcate or weakly alveolate with well- Cf.CT (NI989I87-N198919I), sand, liner, sparse spacedcircular shallow depressions. Lamellausually moss, under ridge-fruited malice {Eucalyptus carries highly refractive segmented strip of inerassata) amongst broombush shmbs yMe{ottin a cerotcgument Sensory seta c2 clavate with globose utuinata), Ferries-McDonald Reserve (35 15 S. caput and many fine pointed cilia, smaller and more 139 09£), 20.vt.I974. numerous than represented (Figs 1 and 3). Hysteronotal setae subequal in length, with Iwo Dislnbuiton longitudinal distal files of cilia (usually only one Australia (Aa>, Siunh Ausnalia Matfoe* file visible when viewed from above). Lentkulus broombush, open scrubland iFctucs-McLUumld smooth, pale, surrounding integument weakly Resetvc). Murray-Darling basin, 3 ,- 1 , 5Of 4 alveolate, futthet laterally cerotegtiment of 8 . 25cnr MaJlee-heath, tall open shrubland conspicuous, either retieulate-foveate or forming ("lambooie Homesiead. near Vlt Fto MC columns in places (Fie. 3). posterodorsally mainly Conservation Park ), Murray Darling basin. 9 lovcate Muhiporose foramina subequal in vj/eand 20'? Cr , 6 oi 8 i 25cm. oval, posuion of FS and /**6 usually as illustrated (Fig. 1), sometimes closer to mid-line, when FS on Remarks adasial side of seta $5 Cerorihanifa incrusiata is the tvpc-specics ol the Podosternum with eircumpedal ridge merged genus and the species-complex The name is derived with rest of subpedal ridge, extending to weak from the I -Tin liltori4Sj(ttiormeaning trustor 'hard custodial ridge fading just anterior to pedotecium coating*", referring to the was iiicrusiatKUi olKii 76 D. C. LEE & C. M. BIRCHBY CM \f\(N0 V b A "5 G /eb^ V </> CO 3 <sf c o ._, CS s B * l-OVORLBAIUUNfc M1IES 77 maximum heights (for 625): I - 31, 11 - 26, 111 - 21, IV - 21, Protcronotum with coslatc translamclla, luminal "^ lamellae, coslate sublamellae (not merging 4 anteriorly with lamellae). Seta J2 shorter (about 0.75') than cl, both hyaline and lorate, weakly dilate (not illustrated in Fig. 6). Integument mainly weakly reticulate. Coslate ridge between setae :2-j2-j2-z2 appearing as second Iranstamella '. Short curved subturorium. Sensory seta z2 wilh globose caput, smooth, without cilia, Hysieronotal setae subequal in length, lorate, weakly ciliatc distally (not illustrated in Fig. 6), rank 5 (75, Z5, S5) curved upwards. Anterior margin extends forward to lie close to seta./'- I entieulus smooth, pale, otherwise integument with reticulate sculpturing. Anterior foramen {F3) as illustrated (Fig. 6) or may encompass adaxial margin of 22 setal base and be attenuated anteriorly, posterior foramina <M, fSk Fb) less than 0.5 • si/c of F3. iaOwm Pore to hysteronotal jrland (hGJ) opens into refractile sac. Podosternum with deep cavity behind 1 lOIJRL y. Cewributula tnvrusiQta sp. nnv., female anterior soma, dorsolateral aspect showing prolcronotal acetabulum IV, formscircumpedal ridge level with and livstoronotiil incrustation ot wax. seta IV2% which does not merge with discidiaJ ridge so subpedal ridge not continuous (i.e as t; trirostrala, Fig. 9, not as C. incntstala, Rg. 2). Seta-; on coxite I differ in size, A 0.5 i /2. Integument present on the proteronotum and sometimes on the reticulate. humeral region o\' the hysteronotum (Fig. 3). The Opisthosternum with setae ofdiffering form and hysieronolum is circular in horizontal aspect, but lenCgths JZgt Sg and JZa short arid setose (siruila. otherwise specimens without an incrustation are to incrustata. Fig. 2); Sa\ lanceolate, length about similar to C wono^ygaia, because of the size and 0.33 x distance JZa\-JZa2\ Sa2 and So3 lorate, the form of the notal setae. On the other hand, the similar to hysteronotal setae, length subequal to presence of a distovcntral seta (v2> on femur J distance JZa\-JZa2. Most ofintegument leuetilate, means that G incrustata is similar to C, triro.strata genital shield smooth, anal shield mainly reticulate- in itschaetotaxy. The waxincrustation, hysteronotal foveatc, just loveate neat lateral margins. Ejajs shape and femoral chaetotaxy arc similar to those subcylindrical with convex ends, 202 - 79 (mean of Reiiculappia reticulata Balogh & Mahunka, of7 horizontally aligned eggs, 32% ofmean female 1966. and this is regarded as reflecting a close length), smooth exoehorion, Number o\' eggs in relationship between these genera, as opposed to female (number of females) as follows: four (I >, six what areregarded asconvergent similarities between U>. Ccrunbatula and Fovorihulula. Legs medium-length (mean femur-tarsus: 49"</n soma), shni (mean maximum tibial height: 30% of mean length). Dorsal porose ureas and strong C^roribatufa hixygafa sp, nov, reticulate abaxial sculpturing on all femora and Hg. trochanters (II and IV. Only 3 setae on femora I f> and II (0-2/1-0). Female Male Dorsal profile of hysteronotum ovoid, colour Unknown dark browu, eerotcgument forms continuous notal (except over lentieulus) and pleural layer, substantial Material examined thickness (greater than diameter of setal bases) Molotypq: 9 (NI9K9I92), soil, litter, moss and including abutting refractile wax granules and other low growth plants under bladder saltbush vegetable detritus, giving translucent dirty white {Atriptex vesicartu) amongst sparse false appearance and obscuring setae. Jdiosomal length sandlewood (Myopontmplatyearputn), Koonatnore 617 in - 2, 609-625). Leg lengths (femur-tarsus for Vegetation Reserve<32 07'S, 139 2I'E), 27.vi.l974. 625): I .119, Fl - 3014 lir - 280. IV - J34. Tibial Paralype: I 9(NI989193) same data as holotype. 78 D. C. LEE & C. M. BIRCHBY rOVORIBATUUNE MITES 7V Distribution Podosternum with circumpedai ridge merging Australia (Aa), South Australia. Semi-and low with distidial ridgeto form a continuous subpedai C shrubland (Koonamore Vegetation Reserve), Lake ridge weakening anteriorly, similar to incrustutu Eyre Basin, 2 9 9/ 2 of 8 u 2Scnr. (Fig. 2). Coxite setae in ranks 1 and 2 similar in size to each other and longer than on C, incntstatu. Remarks Integument with reticulate sculpturing anteriorly. C Ccroribatuta bizygata is regarded, along with on coxite IV small alveoles, monozygata, as the most primitive species in the Opisthosternal setae in file5similar in size, setae genus, having the lowest number of femoral setae. on genital and anal shields (VZx. -flu) slightly It is the second largest species, and is strongly smaller. Most of integument with foveate scleroti/ed, with the result that somecharacters are sculpturing, anterior zone of smaller pits more C clear, but the thick dirty eerotegumeni and weakly extensive than on incrustata (Fig- I'U genital retractile lorate setae make the chaetotaxy difficult shield smooth Eggs oval, 188 n 85 (mean of 5 to assess. The prefix ol its name is derived from horizontally aligned eggs, 33^o of mean female the Latin lfc*meaning 'hvo\ whilst therest is based length), smooth exochorion. Number of eggs in on the Greek 'zygon* meaning -yoke' or *pair\ female (number of females) as follows: none (2), referring to the translameUa as in Zygoribaiuhi one (l)v two (IK four (1), eleven (1). Berlesev 1916 (Oribaiulidae*.and so to the presence Legs medium length (mean femur-tarsus; 46% ul of a second 1ranslamelia\ i.e. the eostate ridge soma), slim (mean maximum tibial height: 31% of between the lamellae and setae/2-yZ mean length). Femora I and tl both with threesetae (0,2/1,0). Cerolegumcnt rarely visible on legs, < troribaial* mono*yg$ita sp. nov. Male Figs 5 and 7 As for femaleexcept margin ofgenital orifice well separated from ventrosejugal apodeme. Soma Female smaller, idiosomal length 438 (semv-arid shrubland, Dorsal profile of hysteronotum ovoid, usually n - 24, 4U-465); 403 (mallee-heathv n - 10, brown with some slraw coloured specimens 382-420). regarded as teneral, leroregument Ibrrns continuous notal (except over lenueulus) and pleural layer, thin, Material examined foveateindentations matching thoseol integument Holotype: 9 (N1989I94), soil, litter, moss and either hyaline or hnely granulate, some attached other low growth plants under bladder saltbush plant detritus, but littleeffect on mite's appearance. (Atriplex vesicaria) amongst sparse false Idiosomal length 495 (semi-arid shrubland. n - 6, sandlewood {Myopotump/atycarpum), Koonamore 465-519); 530 (aridgrassland, n = I), 454(mallee- Vegetation Reserve (32°07 S, 139 21'H), 27.vl.1974. hcath, n - 3, 425-482). Leg lengths (femur-tarsus Paralvpes:59 9 (NI989195-N1989199), 18c9rc-/ for idiosomal length 493, semi-arid shrubland); 1 (N1989200-N1989217); 29 9 - BMNH; 29 - 225, IJ - 220, Ul - 208. IV - 272. Tibial maximum r-MNK; 29 9 NZAC; same data as holotype. heights (for 493); I - 23, 11 - 21, 111 - 18, IV 17. Undesignated; 1 9 (NI9892I8), basesoflovegrass Emu Protcronolum with translamella cosiate across (Eragrostiseriopodo) tussocks, near (26' 41 'S\ midline but laminar laterally, weakly laminar l32a08E), n.x.1976. 39 9 (N1989219-NI9S9221). lamellae, sublamellae eostate, merging anteriorly \{)ifcy (N1989222-N1989231), sand, litter, under with lamella. Setae >2 and d subequal in length, banksia shrubs (Banksia ornata)^ Tamboote bath refiaetile and clavatc, conspicuously ciliaie. Homestead (35^57'S, 140°29'E), 4.vlii.I974 Integument weakly I'ovtaie around rostrum, otherwise smooth- Indistinct line near setay'2- No Distribution subtutorium. Sensory seta z2 with globose caput, Ausiralia (Aa), South Australia. Arid tussock covered in minute cilia, grassland (Great Victoria Desert), "West Plateau, I 9 Hysteronotal setae subequal in length, setose, J 1 of 8 x 25cm2. Semi-arid low shrubland ciliatc distally. Lenticulus smooth, pale, otherwise tKoonamore Vegetation Reserve), Lake Eyre Basin, integument foveate. Anterior lotamen [F3) as 69 P. 24rrcr / 4 of 8 x 25cnv. Mallee heath, illustrated (Fig. 7) or may abut onto posterior tall open shrubland (Tumboorc Homestead, near Mi margin ol 71 setal base, posterior foramina (A4, F5, RescueConservation Park), Murray-Darling liasin, F6) subequal in size to F3. 39 9, I0o*o* / 3 of 8 x 25cm:. riOljRES4aud 5 Rightlegs, posterioraspect io femur-preiarsus,showingsetaeonly on femora I andJl. 4, Cerorifratute iffchffiaia3a*nav*\vgfii-\\.5kC1?rXfri^ = ftersal<^ - veronal LEE&C 80 D. C. M. BIRCHBY ! c -5 CO 1 a CO