ZOOSYSTEMATICA ROSSICA, 19(2): 330–340 30 DECEMBER 2010 Review of species of the genus Cercyon Leach, 1817 of Russia and adjacent regions. V. Subgenus Cercyon Leach, 1817. Cercyon nigriceps-group (Coleoptera: Hydrophilidae) Обзор видов рода Cercyon Leach, 1817 фауны России и сопредельных территорий. V. Подрод Cercyon Leach, 1817. Группа Cercyon nigriceps (Coleoptera: Hydrophilidae) S.K. RYNDEVICH* & F. HEBAUER С.К. РЫНДЕВИЧ*, Ф. ХЕБАУЭР S.K. Ryndevich, Baranovichi State University, 21 Voykova St., Baranovichi, 225404, Brest Province, Belarus. E-mail: [email protected]. *Corresponding author. F. Hebauer, Johann-Krümpel Straße 1, D-94447 Plattling, Germany. E-mail: [email protected] Morphological diagnoses, distribution and environmental preferences of species of the Cercy- on nigriceps-group (subgenus Cercyon Leach, 1817) from Russia and adjacent regions are pre- sented. Cercyon paranigriceps sp. nov. from the Russian Far East and Myanmar is described. Cercyon nigriceps (Marsham, 1802) is recorded from Malta, Ukraine, Gambia and Nepal for the first time; C. setiger Wu & Pu, 1995 is for the first time recorded from Guizhou (China). Приводятся морфологические диагнозы, данныео распространении и биотопических предпочтениях видов группы Cercyon nigriceps (подрод Cercyon Leach, 1817) фауны Рос- сии и сопредельных территорий. Описан Cercyon paranigriceps sp. nov. с Дальнего Вос- тока России и из Мьянмы. Cercyon nigriceps (Marsham, 1802) впервые указан из Мальты, Украины, Гамбии и Непала, а C. setiger Wu & Pu, 1995 из провинции Гуйчжоу (Китай). Key words: Hydrophilidae, Cercyon, taxonomy, distribution, new species Ключевые слова: Hydrophilidae, Cercyon, систематика, распространение, новый вид INTRODUCTION The territory under study includes a sig- nificant part of Central and Eastern Palae- At present, the genus Cercyon Leach arctic within the former Soviet Union and comprises 256 species (including the new the adjacent countries of Europe and Asia. species described here), has a world-wide Marsham (1802) described Cercyon ni- distribution and is subdivided into 11 sub- griceps from Britain. It is distributed in the genera. This article is the third in the series Palaearctic, Nearctic, Afrotropical, Orien- of papers on the genus Cercyon of Russia and tal and Neotropical regions. Our research adjacent regions. The previous papers of this allowed to describe a new species, C. para- series deal with species of the Clinocercyon nigriceps from the Russian Far East and and Conocercyon (Ryndevich, 2007c), Para- Myanmar, very similar to C. nigriceps. The cycreon and Dicyrtocercyon (Ryndevich, Cercyon nigriceps group includes, in addi- 2008), species of the C. dux group (Rynde- tion to the two above-mentioned species, C. vich, 2001a), C. lateralis group (Ryndevich, setiger Wu & Pu, 1995 (Oriental Region), 2004a), C. olibrus group and C. rotundulus C. tachyorictidis Jeannel & Paulian, 1945 group (Ryndevich, 2007b), all of the subge- (Afrotropical Region), C. minax Balfour- nus Cercyon. Browne, 1958, C. subtilis Knisch, 1922, C. © 2010 Zoological Institute, Russian Academy of Scienсes S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON 331 wittei d’Orchymont, 1950 and C. deserticola In Russian and adjacent territories, two Fikáček, Gentili & Short, 2010. species of this group can be encountered, their morphological diagnoses, distribution MATERIAL AND METHODS and environmental preferences are given below. The paper is based on the material from the Zoological Institute of the Russian Cercyon (Cercyon) nigriceps Academy of Sciences, St. Petersburg, Rus- (Marsham, 1802) sia (ZIN), of the Natural History Museum, London, U. K. (BMNH), Zoological Mu- Dermestes nigriceps Marsham, 1802: 72. seum of Moscow State University, Moscow, Sphaeridium melanocephalus var. nigriceps Mar- Russia (ZMUM) and from Dr A.A. Prokin sham, 1802: 103. (CAP) and authors’ collections: F. Hebau- Dermestes atricapillus Marsham, 1802: 72. er’s (CFH) and S. Ryndevich’s (CSR). Dermestes melanocephalus var. atricapillus (Mars- ham, 1802). Material was examined with a Leica MZ Cercyon atricapillum (Marsham, 1802). 12.5 stereomicroscope and MBS-10 stereo- Cercyon nigriceps var. atricapillum (Marsham, microscope. 1802). The possibility of identification of Cer- Dermestes laevis Marsham, 1802: 73. cyon species on the basis of habitus, colour, Cercyon laeve (Marsham, 1802): Stephens, 1829. male genitalia, structure of mesoventrite Dermestes inustus Marsham, 1802: 76. and metaventrite has been studied. The cri- Cercyon inustum (Marsham, 1802): Stephens, teria according to which the species were 1829. united into groups were discussed earlier Sphaeridium centrimaculatum Sturm, 1807: 23. Cercyon centrimaculatum (Sturm, 1807). (Ryndevich, 2004a). Cambrus centromaculatus Sturm, 1807. Cercyon (s. str.) nigriceps var. centrimaculatum Cercyon nigriceps-group (Sturm, 1807). Cercyon nigriceps ab. centromaculatus (Sturm, The Cercyon nigriceps-group includes 1807). very small species (1–2 mm) with oval Cercyon atriceps Stephens, 1829: 151. body, linear clypeus, black head, brown Cercyon nigriceps var. atriceps Stephens, 1839. pronotum, pale maxillary palpi, elytra from Cercyon ustulatum Stephens, 1829: 152. yellow to brownish yellow (sometimes with Cercyon bimaculatum Stephens, 1829: 152. dark spots) without microsculpture, flat Cercyon testaceum Stephens, 1829: 152 (partim). anterior part of elytral intervals and con- Cercyon nubilipenne Stephens, 1835: 401. vex posterior part, narrow or very narrow Cercyon troglodytes Dejean, 1836: 149. Cercyon pulchellum Heer, 1841: 492. preepisternal elevation; metasternum with Cercyon mundum Melsheimer, 1844: 102. femoral lines. The species inhabit different Cercyon vicinale Walker, 1859: 258. kinds of decomposing organic matter. Cercyon nigriceps Motschulsky, 1863: 445. Species of the C. pygmaeus, C. terminatus, Cercyon nigriceps ab. simplex Delahon, 1913: 530. C. impressus and C. melanocephalus groups Cercyon atricapillus (Marsham, 1802): Stephens, come close to the C. nigriceps group in the 1829; Vogt, 1968, 1971; Smetana, 1978, 1988; presence of femoral lines, but differ in some Baranowski, 1985; Bellstedt & Merkl, 1987; features. Species of the C. impressus and C. Hebauer, 1988, 1995a, 1995b; Krause & melanocephalus groups have larger size (2– Zinke, 1989; Kubisz & Szwałko 1991; Rough- ley, 1991; Alexandrovich et al., 1996; Telnov 3.5 mm) and differ in colour and other char- et al., 1997; Prokin et al., 2002. acteristics; species of the C. pygmaeus and Cercyon nigriceps (Marsham, 1802): Stephens, C. terminatus groups (size 1–2 mm) differ in 1829; Zaitsev, 1908, Knish, 1924; Winkler, disposition of femoral lines, form of preep- 1926; d’Orchymont, 1928; Silfverberg, 1992, isternal elevation and colour. They have 2004; Jia, 1996; Romero-Alcaraz, Sánchez- base of pronotum without fine border. Piñero, Áliva, 1997; Hansen, 1999, 2004; © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 332 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON Ryndevich, 2004b, 2005, 2007a; Rynde- Holzschuh, Fifa 1240 m, nr. Gixan, 27–31 vich & Zemoglyadchuk, 2003; Ryndevich March 1983, 1 specimen (CFH). & Tsinkevich, 2004; Hebauer& Ryndevich, Oriental Region. China. 1 specimen, 2005; Hebauer, 2006. Foochow, 28 May 1957, leg. M.S. Yang Type material. Holotype. Sri Lanka; female, (CSR). Laos. 1 specimen, Laos centr., “Type H.T.”, “6352”, “Cercyon vicinale W.” 70 km NE Vientiane, Ban Phabat env., (Walker’s writing), “Cercyon nigriceps (Mar- 150 m, N18°16.1´, E103°10.9´, 27 Apr. – 1 sham), det. Ryndevich S.K., 2008”. May 1997, leg. E. Jendek & Sausa (CFH); Additional material. Palearctic Region. Aus- 11 specimens, Laos NE, Hua Phan Prov., tria. 1 specimen, Vorarlberg, 3630, Lauteracher Ried 405 Soren-Lustenau Schw. Ried 12 June 25 km SE Vieng Xai, Ban Kangpabong env., 1996, Autokäscher, 21 00 Uhr, leg. Ing. Kapp N20°19´, E104°25´, 14–18 May 2001, leg. J. (CFH); 1 specimen, Austria-VLBG 11529, Nen- Bezdek (CFH). Nepal. 1 specimen, Nepal, zing Tschalenga 520–540 m, 13 May 1992, Au- Prov. Narayani, Sauraha, Rapti River Ufer, tokäscher, leg. C.M. Brandstetter (CFH). Bela- 180 m NN, 27°34´80´´N, 84 29´49´´E, LF, rus. 1 specimen, Brest Prov., Baranovichi Distr., 18 Apr. 2000, leg. A. Weigel (CFH). Thai- 16 July 1999, horse dang, leg. S.K. Ryndevich land. 3 specimens, Mae Hong Son Prov., (CSR); 1 specimen, Brest Prov., Pruzhani Distr., N19°27´, E18°20´, 25 May – 2 June 1999, Ruzhany, at light, 3 Aug. 2002, leg. Lundychev D.S. (CSR). Estonia. 1 specimen, Yuriev [now leg. Hauck (CFH). Vietnam. 4 specimens, Tartu], 7 June 1903 (ZIN). Italy. 3 specimens, 180 km SSW of Hanoi, 40 km SW of Than Italia, 356 (ZIN). Malta. 1 specimen, Malta, coll. Hoa, Ben En Natn. Park, 5–8 July 1997, leg. Raffroy (ZIN). Russia. 1 specimen, Yarosl. [avl] Napolov (CFH). gub. [ernia], coll. Yakovlev, 8 July 1894, at flight Note. A large number of synonyms reveal (ZIN); 3 specimens, coll. F. Zaitzev (ZIN); 1 not only wide distribution and an extensive specimen, [Lipetsk Prov.] 30 km E of Elets, Mo- variability, but also difficult identification of rozova gora locality, 14 June 1996; estate, light the species. Of course it was not possible to trap, leg. Tsurikov (CAP). 1 specimen, 30 km E verify all listed synonyms, but in consider- of Elets, Morozova gora locality, 25 July 1998; at UV light, leg. Tsurikov (CAP); 1 specimen, ation that most of them have been described 50 km W of Lipetsk, “Galich’ya Gora” nature from Western Europe (except C. mundum Reserve, leg. Prokin, 8–9 July 1999, leg. Prokin Melsheimer (U.S.A.) and C. vicinale Walker (CAP); 2 specimens, Kursk Prov., Tsentral’no- (Sri Lanka)) it is improbable that the spe- Chernozyomnyi Nature Reserve, Streletskaya cies under description are conspecific with Step’ Division, cow dung, 21 July 2001, leg. any of the listed synonyms. We examined Prokin (CAP); 4 specimens, “UdSSR, Primor- holotype of C. vicinale Walker, 1859 only. skij Kraj, Tschernye Gory, Lux., Venedivnovo, This specimens (female) has all the charac- 1–3 Aug. 1990, leg. A. Pütz” (CFH). Ukraine. 2 specimens, near Kiev (ZMUM); 1 specimen, teristics of C. nigriceps. [Crimea] Al’ma, 29 May 1920 (ZIN). Description. Body oval (index length/ Afrotropical Region. Botswana. 1 width 1.6), widest at base of elytra (Fig. 1). specimen, Botswana, 11 March 1993, Dorsal side slightly convex, shiny, without 18°33´55´´S/24°03´53´´E, Chobe NP Savu- microsculpture. Head black. Clypeus lin- ti-Camp, lux, leg. M. Uhlig (CFH). Gambia. ear, truncate anteriorly. Punctation of head 1 specimen, W. Afr. Gambia, Yundum, 17 Jan. fine and dense. Maxillary palpi yellowish to 1968, leg. Leier (CFH). Namibia. 1 speci- brownish yellow, ultimate segment darker. men, South West Africa, Okahandja, 1249 Antennae yellow to brownish. Pronotum m, 14 March 1979, leg. H. Roer (CFH); 1 transverse, brown with brownish yellow specimen, SWA/Namibia, Dőbra bei Wind- or yellow anterior side and lateral margins. hoek, 27 March 1988, leg. H. Roer (CFH). Sides of pronotum weakly rounded, arcu- Rwanda. Rwanda, Gyangugu Nyakabuye, ately diverging just before posterior an- 28 Oct. – 2 Nov. 1983, leg. Mühle, 1 speci- gles, then converging anteriad. Lateral rim men (CFH). Saudi Arabia. Saudi Arabia, c. continued around hind angles. Punctation © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON 333 - a r u o ol c s, p e c ri g ni C. 0, 1 – 5 s. u t bi a h r, e g eti s C. 3 s; u t bi a h v., o n p. s s p e c ri g ni a r a p C. 2 ); m u t o n o r p of e d si 4, s; u t bi a h 1, ). (3 s – p1 e( ricm gm C. ni0.5 4, e: n. 1, e bar Cercyoa. Scal 0. ytr 1–1of el Figs tion © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 334 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON of pronotum similar to that of head. Pos- Comments. The structure of the apex of terior angles of pronotum widely rounded the paramere is clearly visible only when (Fig. 4). Base of pronotum with fine border. enlarged. In normal state the apices of Scutellum brown, very finely and sparsely parameres are directed outside (everted), punctate. Elytra yellow or brownish yel- and a thick bundle of long hairs is directed low with nine complete deep and one short upwards. However the apex can be directed punctate stria. Colouration of elytra varied inside during preparation, thus being glued (Figs 5–10). Some specimens have brown- to the bundle of long hairs and looking like ish central spot as in Figs 5–8, but some an entire structure and hairs become prac- do not (see Figs 9, 10). Striae distinctly tically indistinguishable as in Fig. 16. With impressed apically, not reaching apex. In- dry preparations of male genitalia of this tervals of elytra with shallow and regular species the structure of the paramere apex punctation, finer than that of head and is difficult to observe due to its malforma- pronotum. Anterior part of elytral intervals tion upon drying. These facts can explain flat, posterior part convex, but intervals at the differences in the figures of C. nigriceps apex flat. Second interval a bit wider than parameres apices by different authors (Vogt, the 3rd and 4th. Ventral side dark brown 1968, 1971; Smetana, 1978, 1988; Hebauer, or black. The majority of specimens have 1995b (as Cercyon sp. 2); Ryndevich, 2004b; metasternal pentagon, preepisternal eleva- Ryndevich & Tsinkevich, 2004). tion, and apex of abdominal segments from Comparison. The species is very simi- brown to yellowish brown. Proventrite tec- lar to C. (Cercyon) setiger Wu & Pu, 1995. tiform, finely carinate medially. Preepister- Cercyon setiger is distributed in the Oriental nal elevation parallel-sided, very narrow Region: China (Guangdong, Guizhou (new (length : width ratio 8.2–8.7), contacting record)) and Myanmar (Jia, 1996; Hebauer elevated middle portion of metasternum at & Ryndevich, 2005). We examined material single point (Fig. 11). Epipleura flat, hori- of C. setiger: China, 9 specimens, China: B.M. zontal. Metasternum forming no ridge and 1980-491, P.M. Hammond, Guizhou: 20 m. S. not delimiting small anterolateral portion Guinn, 22 Sept. 1980, cow dung (BMNH); of metasternum. Metasternal pentagon flat, 4 specimens, China: B.M. 1980-491, P.M. shiny, with very dense shallow punctuation Hammond, Guangdong: Guangzhou, Bai- and two small deepenings in posterior part yunshan, 27 Sept. 1980 (BMNH). Myan- (Fig. 11). Length of preepisternal elevation mar, 2 specimens, Burma, Kinda-Stausee, : length of metasternal pentagon ratio – 1.2. Einzugzgeb. d. Palaung-Flusses, Lichtfang, Metasternum with complete clear femoral 23–25 Nov. 1989, Tobias (CFH, CSR). lines, attaining anterior margin of metaster- Cercyon setiger differs in the shape of num. First segment of abdomen with me- preepisternal elevation, structure of the dian carina, as long as 2nd and 3rd seg- male genitalia, length of the 1st segment ments combined. Male genitalia as in Figs of abdomen. Body oval (index length/ 14–18. Apices of parameres membranous. width 1.6), widest in middle of elytra, more Inner side of paramere near apex with thick abruptly narrowed than in C. nigriceps (Fig. bundle of long dark hairs; in addition, short 3). Elytra yellow or brownish yellow. The hairs present on apex of paramere (Figs majority of the examined specimens have no 14–16). Median lobe gradually narrowed brownish central spot, but some do (Fig. 5). to very sharp apex (Fig. 18). Base of genital The 2nd elytral interval is much wider than segment straight (Fig. 17) Sclerotization the 3rd and a bit wider than the 4th (Fig. 3). of genital segment not complete. Apex of Preepisternal elevation is not parallel-sided, genital segment with sparse hairs. Legs yel- spear-shaped, narrow (length : width ratio lowish or brownish yellow with paler tarsi. 5.6–6), contacting elevated middle portion Length 1–2 mm. of metasternum at single point (Fig. 13). © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON 335 First segment of abdo- men with medial cari- na, has length vividly more than the length of the second and third segments combined. Male genitalia shown in Figs 22–24. Apex of parameres membra- nous. The inner side of paramere near apex has a thick bundle of dark hairs, the outer sides are more rounded than those with C. nigriceps (Fig. 22). Medial lobe is abruptly narrowed to Figs 11–13. Cercyon. 11, C. nigriceps, preepisternal elevation and the apex (Fig. 23). Base metasternal pentagon; 12, C. paranigriceps, preepisternal elevation of genital segment ang- and metasternal pentagon; 13, C. setiger, preepisternal elevation. lular (Fig. 24). Length 1.3–1.9 mm. Cercyon nigriceps is similar to C. (Cer- Is., Namibia, Rwanda, Saudi Arabia (south), cyon) deserticola Fikáček, Gentili & Short. Seychelles, Tanzania, Zaire. This species differs in the shape of preep- Oriental Region: Bhutan, Nepal (new isternal elevation (length : width ratio 2.2– record), China (Fujian), Taiwan, India, Sri 3.8) and structure of the male genitalia. Lanka, Vietnam, Laos, Thailand, Indonesia, Distribution. Palaearctic Region: Aus- Philippines. tria, Azores, Belarus, Britain, Canary Is., Environmental preferences. The spe- Croatia, “Czechoslovakia”, Denmark, Es- cies occurs in dung of horse, cow and other tonia, Finland, France, Germany, Hungary, mammals, and in rotting plants. It comes Ireland, Italy, Japan, Latvia, Lithuania, Ma- frequently to light. deira, Malta (new record), the Netherlands, Norway, Poland, Portugal, Romania, Russia Cercyon (Cercyon) paranigriceps sp. nov. (European part, Far East), Sweden, Swit- zerland, Tunisia, Ukraine (new record). Type material. Holotype: male; Russia, /”Pri- Nearctic Region: Canada (Alberta, morskiy Kray/ PrK.: Tshernye Gory,Venedivnovo, 1–3.8.1990, leg. A. Putz” (CFH). Nova Scotia, Quebec), USA (Alabama, Cal- Paratypes: Russia, 1 female, same data as ifornia, District of Columbia, Florida, Geor- holotype (CSR). Myanmar, 2 males, 1 female, gia, Idaho, Illinois, Indiana, Kansas, Louisi- Burma, Kinda-Stausse, Einzugsgeb., d. Palaung- ana, Maryland, Massachusetts, Michigan, Flusses, 23–25 Feb. 1989, Lichtfang., leg. Tobias Mississippi, Missouri, New Hampshire, New (CFH); 1 female, Burma, Kinda-Damm, 23–25 Jersey, New York, North Carolina, Oregon, Feb. 1989, Lichtfang., leg. Tobias (CFH) Pennsylvania, Tennessee, Texas). Records Description. Body oval (length/width from the Nearctic need confirmation. 1.6), widest at base of elytra (Fig. 2). Dor- Neotropical Region: Jamaica, Lesser sal side slightly convex, shiny, without mi- Antilles (Tobago), Panama, Paraguay, Ar- crosculpture. Head black. Clypeus linear, gentina. truncate anteriorly. Punctation of head Afrotropical Region: Botswana, Gam- fine and dense. Maxillary palpi yellowish to bia (new record), Madagascar, Mascarene brownish yellow, ultimate segment darker. © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 336 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON 8, 1 ); m. wm ral viee: 0.5 ntal veSc nt (w). ee mvi egal sr al nt te ni(v 17, gement e; eg rs meal ranit ae pg of 1, pex w); 2 a 5, 16, sal vie 1r ); do w( ee rsal vian lob s (domedi re0, e2 ramw); with parsal vie n do mes ( ge er te a. 14, param alih nitwit gen e me maleg ps, 9, t e1 gricw); cyon nirsal vie Cer(do 1. be 4–2n lo 1a s di ge Fim © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON 337 Antennae yellow to brown- ish. Pronotum transverse, brown with brownish yel- low or yellow anterior and lateral margins. Sides of pronotum weakly rounded, arcuately diverging just before posterior angles, then converging toward anterior margin. Lateral rim continued around hind angles. Punctation of pro- notum similar to that of head. Posterior angles of pronotum widely rounded. Base of pronotum with fine border. Scutellum brown, very finely and sparsely punctate. Elytra yellow or yellowish brown with nine complete deep and one short punctate stria. Central spot in available specimens absent. Striae distinctly impressed api- cally, not reaching apex. Intervals of elytra with Figs 22–24. Cercyon setiger, male genitalia. 22, tegmen with parameres (dorsal view); 23, median lobe (dorsal view); 24, geni- shallow and regular punc- tal segment (ventral view). Scale: 0.5 mm. tation finer than that on head and pronotum. An- terior part of elytral intervals flat, poste- lines, attaining anterior margin of metaster- rior part convex, but intervals at apex flat. num. First segment of abdomen with me- Second interval somewhat wider than 3rd dial carina, as long as 2nd and 3rd segments and 4th. Ventral side brownish yellow. Me- combined. Male genitalia as in Figs 19–21. sosternum and metasternum brown, apex of Apex of paramere widened, not everted. In- abdominal segments yellowish. Proventrite ner side of paramere near apex with thick tectiform, finely carinate medially. Preep- glued dark hairs (Fig. 19). Median lobe wide isternal elevation parallel-sided, very nar- (Fig. 20). Base of genital segment straight row (length : width ratio 9.2), contacting (Fig. 21). Legs yellowish or brownish yel- elevated middle portion of metasternum at low with paler tarsi. Length 1.3–1.5 mm. single point (Fig. 12). Epipleura flat, hori- Comparison. The new species is very zontal. Metasternum forming no ridge and similar to C. nigriceps, differing from it in not delimiting small anterolateral portion the shape and in the sparser punctation of of metasternum. Metasternal pentagon flat, the preepisternal elevation and metasternal shiny, with very dense shallow punctation, pentagon. Length : width ratio of preep- with two small deepenings in posterior part isternal elevation in C. paranigriceps is 9.2, (Fig. 12). Length of preepisternal elevation in C. nigriceps, 8.2–8.7. Length of preep- : length of metasternal pentagon ratio 1.5. isternal elevation : length of metasternal Metasternum with complete clear femoral pentagon ratio in C. paranigriceps equals © 2010 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 19(2): 330–340 338 S.K. RYNDEVICH & F. HEBAUER. REVIEW OF CERCYON 1.5, that in C. nigriceps, 1.2. Ventral side of Bellstedt, R. & Merkl, O. 1987. Hydraeni- C. paranigriceps is paler. Apical portions of dae, Hydrochidae, Spercheidae, Helophori- the parameres of C. paranigriceps are not dae, Hydrophilidae and Georissidae of the Kiskunság National Park (Coleoptera). Nat- everted, and the median lobe is wide. ural History of the National Parks of Hungary, The C. nigriceps group includes African 5: 169–174. species C. tachyorictidis Jeannel & Paulian, Fikáček, M., Gentili, E. & Short, A.E.Z. 2010. 1945 and C. minax Balfour-Browne, 1958. Order Coleoptera, family Hydrophilidae. In: These species as well as C. paranigriceps have Harten van, A. (Ed.). Arthropod fauna of the wide median lobe but their genital segment UAE, 3: 135–165. Dar Al Ummah Printing, is widened at the apex, and apical portions of Abu Dhabi. the parameres are directed inside unlike C. Hansen, M. 1999. Hydrophiloidea (s. str.) nigriceps, C. setiger and C. deserticola. In ad- (Coleoptera). World catalogue of insects, 2: 1–416. Apollo Books, Stenstrup. dition, apices of parameres are not widened Hansen, M. 2004. Family Hydrophilidae. In: in C. tachyorictidis and C. minax. Löbl, I. & Smetana, A. (Eds). Catalogue Comments. Record of Cercion sp. pr. atri- of Palaearctic Coleoptera. Volume 2. Hydro- capillus (Hebauer, 1995b) refers actually to philoidea – Histeroidea – Staphylinoidea: C. paranigriceps sp. nov. 44–68. Apollo Books, Stenstrup. Distribution. Palaearctic Region: Rus- Hebauer, F. 1988. Hydrophiloidea aus Namibia sia (Far East: Primorskiy Territory); Orien- (Coleoptera; Hydrophilidae, Spercheid- tal Region: Myanmar. ae). Bonner Zoologische Beiträge, 39(2/3): Environmental preferences. Similar to 153–161. Hebauer, F. 1995a. Die Hydrophilidae and those of C. nigriceps. Spercheidae Namibias. Unter Berücksichi- gung des Materials der Namibia-Expedition ACKNOWLEDGEMENTS des Museums für Naturkunde Berlin 1992, ergänzt durch Nachweise aus früheren Na- I am very grateful to the late G.S. Medve- mibia- und Kalahari-Expeditionen (Coleo- dev and A.G. Kirejtshuk (Zoological Institute, ptera, Hydrophiloidea: Hydrophilidae et Russian Academy of Sciences, St. Petersburg, Spercheidae). Mitteilungen aus dem Zoologis- Russia), C. Taylor (The Natural History Mu- chen Museum in Berlin, 71(2): 251–275. seum, London, UK), N.B. Nikitsky (Zoological Hebauer, F. 1995b. Bekannte und neue Hy- Museum of Moscow State University, Moscow, drophiloidea aus Ostsibirien (Col.). Entomol- Russia), A.A. Prokin (Voronezh State Univer- ogische Nachrichten und Berichte, 39: 29–36. sity, Voronezh, Russia), D.S. Lundyshev (Bara- Hebauer, F. 2000. Results of the Lund Univer- novichi State University, Baranovichi, Belarus) sity Ceylon Expedition 1961, Hydrophilidae for lending the material, A.V. Zemoglyadchuk with an updated Sri Lanka check list (Co- (Baranovichi State University, Baranovichi, Be- leoptera: Hydrophilidae). 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