Cercyon (Cercyon) quisquilius
Creators: name: Ryndevich, Sergey K.
name: Jia, Fenglong
name: Fikáček, Martin
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hydrophilidae
Cercyon
Cercyon quisquilius

description: Cercyon (Cercyon) quisquilius (Linnaeus, 1761)
(Figs 7, 13)
Scarabaeus quisquilius Linnaeus, 1761: 138. Transferred to Cercyon by STEPHENS (1829: 153).
Cercyon guangxiensis Wu & Pu, 1995 in JIA et al. (1995:128).Synonymized with C.quisquilius by JIA et al. (2011:48). For complete synonymy see HANSEN (1999).
Type locality. Sweden.
Type material. Scarabaeus quisquilius: SYNTYPES: The species was described from Sweden based on an unspecified number of specimens. Based on the on-line catalogue of the Linnaeus collection, there are two pinned specimens present in the collection, one with labels ‘83 [p] // quisquilius’, the second without any label data. We consider both these specimens as syntypes. Based on the photographs available on-line, both correspond well with the European specimens treated under the name Cercyon quisquilius by the body form and coloration (yellow elytra, dark pronotum with pale lateral sides).
Cercyon guangxiensis. HOLOTYPE: male (SYSU): “ Nanning, 19.vi.1977, leg. Zhihe Huang [transcribed from Chinese] // Holotype, Cercyon guangxiensis sp. nov., det. Pu et Wu”. PARATYPES: 1 female (SYSU): same label data as the holotype; 2 spec. (SYSU): Shanghai.
Additional material examined. CHINA: GUANGDONG: 4 spec. (SYSU): Lianzhou, Dadongshan Natural Reserve, 25.ix.2008, Yun Wang leg. HEBEI: 26 spec. (SYSU): Handan, Shexian county, Piancheng, 1190m, 36°44’02’’N 113°39’30’’E, 1.viii.2003, Xie & Lin leg. HEILONGJIANG: 5 spec. (SYSU): Wudalianchi, 9.viii.2005, Fenglong Jia leg. HUBEI: 79 spec. (SYSU): Dabieshan Mt., Wujiashan, 31°7.6’N 115°45.1’E, 29.vi.2014, light trap, Liu Zhenhua leg.; 24 spec. (SYSU): Dabieshan Mt., Qingtaiguan, 31°12.2’N 115°42.1’E, 1–4.viii.2014, Liu Zhenhua leg.; 3 spec. (SYSU): Dabieshan Mt., Taohuachong, 30°50.9’N 116°1.7’E, 25.vi.2014, Liu Zhenhua leg. NEI MONGOL: 79 spec. (SYSU): Linxi county, Husitai village, 23.viii.2003, Fenglong Jia leg.; 2 spec. (SYSU): Hulunbeir, Yiminhe town, 28.vii.2014, Fenglong Jia leg.; 1 spec. (ZISP): Manchuria, Greater Khingan Mts., station Zhalantun [ca. 48°N 122°43’1.2”E], 1905, Lakshevits leg. JIANGXI: 5 spec. (SYSU): Sanqingshan, 28.93°N 118.05°E, 15–16.v.2012, Living leg. SICHUAN: 11 spec. (SYSU): Luding, Hailuogou, 1100–2900 m, 3–4.vii.2012, Living & Chen leg.; 2 spec. (NHMB): Maowen, 1000 m, 31.30°N 103.5°E, 10–18.vii.1990, J. Kolibáč leg.; 1 spec. (NHMB): Songpan, 2000 m, 32.3°N 103.4°E, 13–17.vii.1990, J. Kolibáč leg. YUNNAN: 4 spec (SYSU): Jingdong County, Taizhong Town, 24°30‘N 100°56‘E, 1395 m, 15.iv.2015, Renchao Lin & Yudan Tang leg.; 16 spec. (NHMB): Lijiang, Xiangshan, 2400 m, 6.vii.1990, V. Kubáň leg.; 1 spec. (NHMB): Yulongshan Mts., Baishui, 2900–3500 m, 27°08N 100°14E, 7–12.vii.1990, V. Kubáň leg.; 1 spec. (NHMB): 60 km SEE of Kunming, Shilin (Stone Forest), 3.vii.1990, V. Kubáň leg.; 1 spec. (NHMB): Lijiang, 2600 m, 30.vi.–2.vii.1990, L. & M. Bocák leg.; 1 spec. (NMPC): Zizhi, at light, 1995 m, 25°43.7’N 98°34.1’E, 29.vi.–2.vii.2016, J. Hájek & J. Růžička; 2 spec. (NMPC): Tongbiguan vill., at light, 1340 m, 24°36.7’N 97°39.4’E, 24–26.vi.2016, J. Hájek & J. Růžička lgt. ANHUI: 1 spec. (NHMB): Dabieshan, 65 km SW of Huoshan, 1400 m, 21–22.vi.1998, Bolm leg. HENAN: 8 spec. (NHMB): 10 km S of Guanpo, 1600 m, 17.vii.1998, Bolm leg. QINGHAI: 3 spec. (NMPC): Yunning Si lamasery, 2890 m, 36°45.6N 102°10.6E, 16.vii.2005, J. Hájek, D. Král & J. Růžička leg.; 1 spec. (NMPC): 6.6 km NW of Golmud, 2805 m, 36°25.7N 94°51.2E, 8.vii.2005, J. Hájek, D. Král & J. Růžička leg. GANSU: 3 spec. (ZISP): sel. Say-Duytszy, Gobiysk okr. Gan’su, [Gobi Region, =? Sai Duizi], ix.1901, Kozlov leg. SHAANXI: 1 spec. (CSR): S of Huaxian, SE Damingzhen, Huashan Mts., 2010 m, 34°18‘27‘‘N 109°49‘52‘‘E, 24.v.2009, Belousov & Kabak leg. JAPAN: HOKKAIDO: 1 spec. (KMNH): Rumoi, Tôge-shita, vi.2009, Y. Minoshima leg. HONSHU: 17 spec. (KMNH, NMPC): Ibaraki Pref., Ishige-machi, vi.2002, T. Shimada leg.; 1 spec. (KMNH): Kanagawa Pref., Atsugi-shi, Funako, 5–12.vii.2007, K.Usui leg.; 1 spec. (KMNH): Shimane Pref., Oki Islands, Dôgo Island, Goka-mura, mouth of Omosu-gawa River, light trap, 21.vii.2003, T. Shimada leg. KYUSHU: 1 spec. (KMNH): Fukuoka Pref., Tagawa-shi, at light, 10.vi.1958, Y. Takakura leg.; 2 spec. (KMNH): Fukuoka Pref., Tagawa-shi, 28.vi.1978, Y. Takakura leg.; 1 spec. (KMNH): Fukuoka Pref., Tagawa-shi, Higashi-machi, 5.x.1982, Y.Takakura leg.; 1 spec. (KMNH): Fukuoka Pref., Tagawa-shi, Urano, 14.vi.1958, Y.Takakura leg. MONGOLIA: BHAZANKHONGOR: 1 spec. (ZISP): W predg. Ikhe-bagdo, Gob. Altay, Mong. [the foothills of Ikh-Badg Mts., Gobi Altai,. Mongolia], 15.viii.[19]26, Kirichenko leg. KHUVSGUL: 7 spec. (ZISP): r. Khorioy yu. prit, oz. Dod-nor, Grenk. kr., [southern tributary of Khorioy river, Dood-Tsagan-nuur lake, Grenk Mts.], 6.vi.[18]80, Pytanin [leg.]. UMNUGOVI: 2 spec. (ZISP): Mongoliya, YuzhnoGobiysk. aymak, Bordzon-Gobi, 80 km. YuYuV Nomgona [South Gobi region, Bordzon-Gobi, 80 km SSE of Nomgon], 5–8.viii.1967, Emel’yanov & Kerzhner [leg.]. TÖV: 2 spec. (ZISP): Ushch. Sutszukte, yu-z. Kentey, Mongoliya [Suzukte ravine, SW Khentii Mts. Mongolia], 28–31.v.[1]925, Kozlov [leg.]; 1 spec. (ZISP): Syutszukte, yu.- v. Kentey, s. z. Urchi [Suzukte ravine, SE Khentii Mts., NW of Urchi], 13–28.v.1925, Kozlov [leg.]; 15 spec. (ZISP): Mongoliya, Tsentralnyy aymak, 150 km Yu Yu Z Ulan-Batora [Central Aymak, 150 km SSW of Ulan-Bator], 2.ix.[1]969, Gur’eva [leg.]; 4 spec. (ZISP): same data, but 27.viii.[1]967. ZAVKHAN: 1 spec. (ZISP): Shuryk bl Ulyasutaya, S-Z Mongoliya [Shuryk near Uljassutai, northwestern Mongolia], 20.viii.1877, Pytanin leg. Without precise data: 1 spec. (ZISP): S-Z Mongoliya [= NW Mongolia], 1877, Pytanin [leg.]; 14 spec. (ZISP): ‘ Sogtan, S-Z Mongoliya’ [= NW Mongolia], 1877, Pytanin [leg.]. RUSSIA: TYUMEN OBLAST: 5 spec. (ZISP): Tobolsk, 2.v.1924, Samko [leg.]; 1 spec. (ZISP): Tyumen, Tobolsk. g. [guberniya], 11.v.1925 [without collector]; 1 spec. (ZISP): Ishim [without date and collector]. OMSK OBLAST: 2 spec. (ZISP): Tara [without date and collector]. ALTAI KRAI: 8 spec. (ZISP): Sib. oc. Severnaja step. Kulunda, 18.viii. [1]922, Reichardt [leg.]; 5 spec. (ZISP): same data but 15.viii.[1]922; 3 spec., (SZMN):YuZ Altay, okr. Alekseevki, vdkhr. na Ortaterekty, konsk. navoz [Alekseevka env., horse dung], 15.vi.1997, R. Dudko & V. Zinchenko leg.; 1 spec. (ZISP): ‘r. Kyerlyk 15 v. ot Tengy Biys. u., Silant’ [Onguday district], 5.vii.[18]97, without collector. ALTAI REPUBLIC: 1 spec. (ZISP): Chuyskaya step, pik Yustyd’, 2.vi.1907, [without collector]; 6 spec. (ZISP) Uznezya na Katuni, 4–6.viii.[1]909, Gorchakovskiy [leg.]; 1 spec. (ZISP): same data but 22.vi.[1]909; 1 spec. (ZISP): Barnaul, Tom. g. [Tomsk guberniya], 22.vii.[1]911, Sentenina [leg.]; 1 spec. (ZISP): Zmeinigor. okr., Tomsk. gub. [Zmeinogorsk district, Tomsk region], ‘d. [village] Sabushka’, 31.v.1908, V. Khvorov [leg.]; 2 spec. (CSR): Altay, okr. [env.] Kosh-Agach district, 26.v.1989, Saluk leg. NOVOSIBIRSK: 2 spec. (SZMN): Novosib. obl., Karasukskiy r-n, okr. s. Troitskoe, korov. navoz, [Karasuk district, env. vill. Troitskoe, cow dung], 24.vii.1995, V. K. Zinchenko [leg]. KEMEROVO OBLAST: 4 spec. (ZISP): Kuznetsk, Tomsk. g. [guberniya], 28.v.[1]908, Khvorov [leg.]; 12 spec. (ZISP): Tisul’, Mariin. u., [Mariinsk uyezd, = distict] Tomsk. g. [guberniya], 6.vi.[1]911, Gorchakovskiy [leg.]; 1 spec. (ZISP): same data but 13.vi.[1]911; 1 spec. (ZISP): Shor-su river, Kuznetsk Alatau, 12.vii.[1]908, Khvorov [leg]. KRASNOYARSK KRAI: 1 spec. (ZISP): Uchum, 1892, Glassunov [leg.]; 2 spec. (ZISP): Taseevo, Kansk. u. [uyezd, = district], Enis. g. [Yeniseysk guberniya], [1]914, Varaksina [leg.]; 3 spec. (ZISP): Yurty Kansk u. [uyezd, =district], ‘ Enis. g.’ [Yeniseysk guberniya], 13.v.[1]912, Mishin & Verkhov [leg.]; 1 spec. (ZISP): Krasnoyarsk, ‘ Enis. g. [Yeniseysk guberniya], Anuchino’, 28.v.1905, [without collector]. IRKUTSK OBLAST: 1 spec. (ZISP): r. Belaya, sist. Angary, Irk. g. [Belaya river, tributary of Angara, Irkutsk guberniya], [18](74), Gartung [leg.],; 1 spec. (ZISP): s. Padun na V. Tunguske, Irk., [village Padun on Verkhnyaya Tunguska (old name of lower part of Angara river), Irkutsk guberniya] [18]67, Chekanovsk. [leg.]; 1 spec. (ZISP):st.[ation] Malta, Sibirskaya zh. d. [Siberian Railway], vi.1901, D.A. Smirnov leg.; 2 spec. (ZISP): s. Ust’ Khut, lev. ber. r. Leny [Ust-Khut, left bank of Lena river], 2.vi.[19]25, Ivanov [leg.]. SAKHA REPUBLIC: 1 spec. (ZISP): okr. Yakutska, [Yakutsk env.], [1]901, Olenin. [leg.]; 6 spec. (ZISP): okr. Yakutsk [env.], 1915–16, Yurynskiy [leg.]; 20 spec. (ZISP): Yakutsk, 28.vii.1927, Moskvin [leg.]; 3 spec. (ZISP): same data, but 17.vi.1927; 1 spec. (ZISP): M. Cherapanikha, Yakutskaya obl. [Malaya Cherapanikha river, Yakutsk oblast], 15–16.vi.[19]07, Kharitonov [leg.]; 1 spec. (ZISP): same locality, but 31.vii.[19]07; 6 spec. (ZISP): [lake] Syargyalyakh, 3 ver. ot Yakutska [Yakutsk env.], 23.v.1911, I. Afanas’ev [leg.]; 1 spec. (ZISP): Zhamkonsk. nasl. Yakuts okruga, [Zhemkonskiy nasleg,Vilyuysk district, near Yakutsk], 8.vii.[1]925, Bianki [leg.]. BURYAT REPUBLIC: 1 spec. (ZISP): Mondy, 3.vi.1915, S. Rodionoff [leg.]. ZABAYLSKIY KRAI: 1 spec. (ZISP), Targituy k S ot Chity, Zabayk., [Targituy N of Chita, Transbaikal], 15.vii.1914, Gavrilyuk [leg.]. JEWISH AUTONOMOUS OBLAST: 1 spec. (ZISP): Raddevka-na-Amure [= Radde], [18]76, Khristof leg. KHABAROVSK KRAI: 1 spec. (ZISP): Khabarovsk, Primorskaya obl., vi–vii.1905, Gudzenko [leg.]; 1 spec. (CSR): Khabarovsk area, Chirki, at UV-light, 27.vii.1992, A.V. Frolov leg. PRIMORSKY KRAI: 1 spec. (ZISP): Ussuriysk, Primor. [Primorye], 20.viii.1969, Kryzhanovskiy [leg.]; 2 spec. (ZISP): Vladivostok, Primor. o. [Primorskaya Oblast], 17.v.1916, Rimskiy-Korsakov [leg.]; 5 spec. (ZISP): same data, but 24.viii.1914; 1 spec. (ZMMU): Ussuriyskiy zap-k [Ussuriysk Nature Reserve], 19.vi.1980, Nikitskiy [&] Belov [leg.]; 3 spec. (ZMMU): Kamenushka, bl. Ussuriyska [near Ussuriysk], 6.viii.1980, Nikitskiy [&] Belov [leg].; 1 spec. (ZISP): sopka Kamen. Padi, Kam-Rybol, [lake] Khanka, 5–6.viii.[19]08, Cherskiy leg.; 4 spec. (ZISP): Kamen’-Rybolov, [lake] Khanka, 5–7.ix.[19]08, Cherskiy [leg.]; 1 spec., (ZISP): s. [vill.] Troitskoye, oz. Khanka [lake], 1.vii.[19]09, Cherskiy [leg.]; 2 spec. (ZISP): same data but 5.vii.[19]09; 2 spec. (ZISP): same data but 14.vii.[19]09; 2 spec. (ZISP): same data but 16.vii.[19]08; 4 spec. (ZISP): same data but 17.vii.[19]09; 11 spec. (ZISP): same data but 22.vii.[19]09; 5 spec. (ZISP): same data but 28.vii.[19]09; 1 spec. (ZISP): same data but 5.ix.1914; 1 spec. (ZISP): Vladivostok, Primor.obl. [Primorskaya Oblast], 13–26.viii.1911, Berger [leg.]; 3 spec. (ZISP): same data but 29.viii.–11.ix.1911; 1 spec. (KMNH): Banevurovo, 10–12.vii.1997, A. Khvylya leg. SAKHALIN OBLAST: 2 spec. (ZISP): Kunashir [Is.], Alëkhino, 15.vi.1973, Kerzhner [leg.]. KAZAKHSTAN: EAST KAZAKHSTAN: 1 spec. (CSR): Kazakhstan, Jungar Alatau Mts., area of river Musdybulak, 24.viii.1994, A.V. Frolov leg.; 1 spec. (ZISP): Jungar Alatau Mts., Topolevka, 5.v.1957, Kerzhner leg. WEST KAZAKHSTAN: 1 spec. (ZISP): okr. Uralska [Uralsk env.], 19.v.[19]06, [leg.] B. Uvarov. ZHAMBYL: 1 spec. (ZISP): Merke, Syrdar.obl. [Syrdarya region], 16.v.1910, Kirichenko leg.; 1 spec. (ZISP): St.Akyr-Tyube, Turksib [Akyr-Tyube station,Turkestan–Siberia Railway], 5.vii.1930, Bianki [leg.]. KYZYLORDA: 2 spec. (ZISP): okr. Perovska [Perovsk env.], 15.vi.1925, [without collector]. KYRGYZSTAN: ISSYK KUL: 3 spec. (CAK): near Issyk-kul lake, 22.viii.1983, O. G. Guseva leg. JALAL ABAD: 1 spec. (CSR): Kirgizia, Tian-Shan, Fergana Mts., near Kek-Art river, 1800 m, in excrements, 41°08’N 73°35’E, 25.vii.2010, S.V. Saluk leg. TALAS: 2 spec. (ZISP): Talass, iv.[19]08, Fisher leg.; 8 spec. (ZISP): Talass-Thai, Fisher leg.; 1 spec. (ZISP): Talasskiy Alatau, iv.[19]09, Fisher leg. TAJIKISTAN: GORNO- BADAKHSHAN: 3 spec. (ZISP): Pamirskiy post na r. Murgab [Pamirskiy Post at Murghab river], [1]901, Fedchenko [leg.]. KHATLON: 2 spec. (ZISP): okr. Kulyaba, Tadzhik [Kulob env., Tajikistan], 28.viii.1933, V. Popov [leg.]; 3 spec. (ZISP): Kurgan-Tyube, Tadzh., [Qurghonteppa, Tajikistan], 15.vi.1939, Kryzhanovskiy [leg.]; 1 spec. (ZISP): parkhar na r. Pyandzh, Tadzhikistan, [Parkhar (= Farkhor) at Pyandzh river], 29.vi.[1]934, Luppova [leg.]; 1 spec. (ZISP): Kabadian, Tadzhikistan,18. vi.1934, Gusakovskiy [leg.]; 1 spec. (ZISP): istoki Amu-Dar’i, [headwaters of Amu-Darya river], 6.viii.[19]08. SUGHD REGION: 1 spec. (ZMMU): Tadzhikistan, Kondara, ushch. [ravine] Varzana, 22.vi.1920, L. Zimina [leg.]. TURKMENISTAN: ASHGABAT: 1 spec. (ZISP): Askhabad [= Ashgabad], Zakasp. obl. [old name of Transcaspian Oblast], [18]96, Anger [leg.]. MARY: 1 spec. (ZISP): Merv, Sredne-Az. Zh.d., 15.vi.1905, Sumakov [leg.]. BALKAN: 4 spec. (ZISP): ‘ Trans-Caspi G. Turcmenien’, E. König [leg.]. UZBEKISTAN: KASHKADARYA: 1 spec. (ZISP): Bukhara, Guzar-Dar’ya, Guzar’, 1904, Suvorov [leg.]; 1 spec. (ZISP): Kummashi na NO ot Guzara, Bukh [= Kamashi, NE G‘uzor, Bukhara], 12.vi.1932, Radd [leg.]. TASHKENT: 2 spec. (ZISP): Pskemskiy khr. Nanay, Pskemskiy khrebet [Psemskiy ridge], r-n, kish. Nanay, ca. 1000 m, 27.v.1998, Gur’eva [leg].; 3 spec. (ZISP): Golodnaya step [= Guliston of Sirdaryo region], Sr.Az. zh.d. [= Middle Asian Railway], Khadzh. U. [= old name for Khojent uyezd = district], 28.iv.[19]03, G.Yakobson [leg.]; 13 spec. (KMNH, NMPC): Tashkent env., 6.ix.2000, [without collector]. LEBAP: 1 spec. (ZISP): Czardjui [= Chardzhui], 16.v.[19]05, Fisher leg.; 1 spec. (ZISP): ‘ Chardzhui, S.-Z. Bukhara’ [= Chardzhui], 4.ix.[19]04, E. Fisher [leg.]; 3 spec. (ZISP): Chardzhui, 30.ix.[19]04, Fisher [leg.]; 1 spec. (ZISP): same data but 20.xii.[19]04; 2 spec. (ZISP): same data but 4.v.[19]05; 1 spec. (ZISP): same data but 9.v.[19]05. IRAN: 10 spec. (ZISP): Persia, Caspii [coast of the Caspian Sea], 26.ii.1915, Hassanleiaden leg. SYRIA: 1 spec. (ZISP): Syrien. TURKEY: 1 spec. (ZISP): Sarykamyş et vicina, 14.vii.14; 1 spec., (ZISP): Kozik distr., Erzerum, ix.17, coll. Zaytsev.
Published records. RUSSIA: ALTAI REPUBLIC: near Kosh-Agach (PROKIN et al. 2008). KHABAROVSK: 20 km N of Troitskoe, bank of Amur river (HEBAUER 1995). PRIMORSKY KRAI: Chernye Gory, Venedivnovo [likely misspelled form of “ Venevitinovo ”] (HEBAUER 1995). SAKHALIN OBLAST: Is. Iturup, Rubetsu [= Pioner] (ÔHARA & JIA 2006). TAJIKISTAN: DISTRICTS OF REPUBLICAN SUBORDINATION: Pamir-Alai, Hassar Mts., near Marsob, Adshuk-Cleft (HEBAUER 1991). KAZAKHSTAN: KYZYLORDA: Lake Kymyshlybas; Mamyr (both TERMESHEV 2016). SOUTH KAZAKHSTAN: Kyzylkum, Baymahan wells; Syr-Darya 60 km E of Arys; on the shore of Shardara reservoir (all TERMESHEV 2016). JAMBYL: Tasotkel reservoir (TERMESHEV 2016). UZBEKISTAN: SURKHANDARYA: Uchkizil (PROKIN et al. 2016). NEPAL: KARNALI: Chauta Sinja Khola (HEBAUER 2002a). CHINA: NEI MONGOL: Hailar; Hulunbeir, Zhalainuor; Linxi county, Zhanpu (all JIA et al. 2011). QINGHAI: Yunning Si lamasery (JIA et al. 2011). GUANGXI: Yangshuo (JIA et al. 1995). SHANGHAI: Shanghai (JIA et al. 2011). MONGOLIA: KHENTII: Onon-Balj National Park, Bayan-Ovoo (KORSUN et al. 2012). JAPAN: HOKKAIDO: Tomakomai (SHARP 1884). FUKUOKA: Kawatchi [= Kawachi] (SHARP 1874).
Diagnosis. Elytra and pronotum without hairs; head black; pronotum black with narrowly pale lateral margins; elytra and epipleuron yellow to brownish-yellow; maxillary palpomeres yellowish or yellowish-red, last palpomere darker; elytral intervals flat; mesoventral plate very narrowly elongate, ca. 5.5–6.2× as long as wide; metaventrite without femoral lines; fifth abdominal ventrite not emarginate apically; paramere rather wide at base, slightly sinuate on outer margin, rounded apically, apex with setae; median lobe widest near apex, slightly narrowing towards base, basal apodemes long; median projection of sternite 9 narrowly rounded apically, base strongly arcuate.
Redescription. Form and color. Body elongate oval (Fig. 7A), length 1.8–2.7 mm, width 0.9–1.3 mm. Head black with very small brownish preocular spots. Pronotum black with narrowly yellowish to yellowish-red margins, anterior margin very narrowly pale, base of pronotum very narrowly pale only near posterolateral angles. Scutellum black to dark brown. Elytra and epipleura pale yellow to brownish-yellow. Antennae yellowish except for darker club. Maxillary palpomeres yellowish or yellowish-red, last palpomere darker. Ventral surface dark brown to black, mesoventral plate and metaventral pentagon brown to dark brown, posterior margins of abdominal ventrites brownish. Legs yellow to brownish-yellow.
Head. Clypeus with dense, moderately coarse punctures, interstices without microsculpture. Anterior margin of clypeus with narrow bead. Frontoclypeal suture undetectable. Frons without microsculpture on interstices. Eyes small, somewhat protruding, interocular distance ca. 6.0× the width of one eye in dorsal view. Mentum glabrous, ca. 1.6× as wide as long, densely and coarsely punctate. Antennae with 9 antennomeres, scapus ca. 1.3× as long as antennomeres 2–5 combined, club compact. Maxillary palpomere 2 strongly swollen, palpomere 4 almost symmetrical, equal to palpomere 3 in length.
Thorax. Elytra and pronotum without hairs. Pronotum ca. 1.9–2.0× as wide as long. Pronotral punctation similar to that on head. Lateral margins of pronotum with narrow bead overlapping anterior and posterior corners, anterior and central part of posterior margin of pronotum without bead. Prosternum with strong longitudinal carina medially; antennal groove distinct, moderately large, rounded laterally. Mesoventral plate narrowly elongate, ca. 5.5–6.2× as long as wide, widest at midlength (Fig. 7F). Metaventrite with raised, glabrous, sparsely punctate median pentagonal area; femoral lines absent. Elytra with ten punctate striae, striae 1–9 impressed and reaching base, stria 10 very short; intervals flats, ground punctures on intervals very fine; humeral bulge indistinct. Epipleura flat, horizontal. Femora with sparse and shallow punctures ventrally, with distinct tibial groove. Tarsi with densely arranged whitish setae ventrally, first metatarsomere about as long as metatarsomeres 2–3 combined.
Abdomen. Abdomen with five ventrites, first ventrite distinctly longer than other ventrites, ca. 2× as long as second ventrite, bearing distinct median longitudinal carina, fifth ventrite arcuate, not emarginate apically.
Male genitalia (Figs 7B–D). Phallobase slightly longer than parameres, asymmetrical basally. Paramere rather wide basally, slightly sinuate on outer margin, asymmetrically rounded apically; apex membranous, with setae. Median lobe widest near apex, slightly narrowing towards base, with long ароdemes, apex triangular, obtusely pointed; gonopore small, situated subapically. Median projection of sternite 9 narrowly rounded apically, bearing 4 short subapical setae; base strongly arcuate, median portion shorter than lateral struts.
Variation. The species varies in size, but otherwise is very uniform across its range; in some specimens, the base of the metaventral pentagon is yellowish-red.
Biology. Polysaprophage. It inhabits mainly the excrements of mammals (cows, horses, sheep and others). It frequently occurs in compost, rotting plant debris, rotten mushrooms (SMETANA 1978, 1988; NIKITSKY et al. 1996; RYNDEVICH 2004с, 2007). Some specimens were also collected in the nest of black stork Ciconia nigra (Linnaeus, 1758) (LUNDYSHEV & RYNDEVICH 2010). The species comes frequently to light.
Distribution. The species is widespread in the whole Palaearctic Region and in North America south to Mexico. In Asia, it is recorded from ca. 62°N in Russia (Western and Eastern Siberia, Far East) south through Mongolia to China including its southern provinces (Gansu, Henan, Jiangxi, Inner Mongolia, Qinghai, Shaanxi, Sichuan, Guangxi, Shanghai, Yunnan), Japan (Hokkaido, Honshu and Kyushu) and Nepal, and through Central Asia (Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan) to Turkey, Iran, Israel and Syria; no records are known from northern and central Kazakhstan and from the proper Tibetan Plateau. Cercyon quisquilius is also introduced outside of its native range to the Pacific (Hawaii: HANSEN 1995), Australia (Fikáček, unpubl. data) and Neotropics (Argentina, Caribbean: FIKÁČEK 2009, ARRIAGA- VARELA et al. 2017). New for Chinese province of Anhui, Gansu, Guangdong, Hebei, Heilongjiang, Henan, Hubei, Jiangxi, Shaainxi, Sichuan and Yunnan, and for Kyrgyzstan, Turkmenstan, Syria and Iran.
description: Published as part of Ryndevich, Sergey K., Jia, Fenglong & Fikáček, Martin, 2017, A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae), pp. 535-576 in Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) (Acta. Ent. Mus. Natl. Pragae) 57 (2) on pages 552-557, DOI: 10.1515/aemnp-2017-0089, http://zenodo.org/record/5318472