Trichodromeus ketmeniensis ( Bordoni, 1985 )

Shavrin, Alexey V., 2024, Review of Hygrogeus Mulsant & Rey, 1880 and Trichodromeus Luze, 1903, with descriptions of three new genera from the eastern Palaearctic Region (Coleoptera: Staphylinidae: Anthophagini: Omaliinae), Zootaxa 5531 (1), pp. 1-62 : 18-21

Trichodromeus ketmeniensis ( Bordoni, 1985)

( Figs 4–5 , 43–46 , 48 )

Neogeodromicus ketmeniensis Bordoni, 1985: 374 .

Trichodromeus ketmeniensis : Zerche 1992: 128, Herman 2001: 373, Smetana 2004: 252, Shavrin & Klimenko 2008: 197, Schülke & Smetana 2015: 326, Hlavač et al. 2016: 3.

Trichodromeus ovchinnikovi Shavrin & Klimenko, 2008: 195 syn. n.

Type material examined. Holotype ♂ ( Fig. 5 ; dissected; damaged: left antennomeres 3–11, right antennomeres 5–11 missing and hind legs missing): ‘ 17.07.1983 [side-printed from the left] | Kyrgyzstan | 5 km up from mouth |

of Kaindy R. | Ovchinnikov S.V.’ <printed>, ‘ HOLOTYPUS | Trichodromeus | ovchinnkovi sp.n. det. | Shavrin & Klimenko 2008 ’ <red, printed>, ‘ Trichodromeus | ketmeniensis Bordoni, 1985 | Shavrin A.V. det. 2024’ <printed> ( ZIN).

Paratype: 1 ♀ (dissected; left antenna and left middle leg missing): same data as the holotype, with additional printed labels: ‘ PARATYPUS | Trichodromeus | ovchinnkovi sp.n. det. | Shavrin & Klimenko 2008 ’ <red>, ‘ Trichodromeus | ketmeniensis Bordoni, 1985 | Shavrin A.V. det. 2024’ ( ZIN).

Material examined. KAZAKHSTAN: EAST KAZAKHSTAN REGION: 2 exs.: Altai, connections of Tauchilik and Karakoba rivers. 06.08.1989. V. Kashcheev leg. ( ZIN); 1 ♂: Ugam Mts., Sary-Aygyr River. 11.08.1988. V. Kashcheev leg. ( ZIN); ALMATY: 1 ♀: Ketmen Ridge, Dolaity River. 16.06.1988. V. Kashcheev leg. (cSh); 10 ♂♂, 6 ♀♀, 14 exs.: same data. 12– 15.07.1988. (cSh, ZIN); 5 ♂♂, 1 ♀: same data. 20.07.2009. (cSh, ZIN); 8 ♂♂, 4 ♀♀: same data, Kulbastau [=Kol`bastau] River. 14.07.1987. (cSh, ZIN); 4 ♂♂, 3 ♀♀, 6 exs.: same data. 2800 m a.s.l. 20.08.1987. (cSh, ZIN); 95 ♂♂, 109 ♀♀: same data. 3300 m a.s.l., under stones along snowfield and in litter near stream. (cSh, ZIN); 52 ♂♂, 39 ♀♀: same data. 22.07.1987. (cSh, ZIN); 18 ♂♂, 8 ♀♀: same data. 2800–3800 m a.s.l. 20.08.1987. (cSh, ZIN); 1 ♂, 3 ♀♀: same data, 09.06.1988 (cSh); 27 ♀♀, 36 exs.: same data. 20– 27.07.1988. ( ZIN); 1 ♂, 1 ♀: Zhalanash. 14.07.1984 (cSh); 1 ♂, 1 ♀: same data, Zhinishke River. 22.06.1988. ( ZIN); 3 ♂♂: Bolshoy Kirgisay. 10.08.1988. V. Kashcheev leg. (cSh); 8 ♂♂, 8 ♀♀: Kungey Alatau, near Alma-Ata, 77°00’N 43°10’E. 07.1990. 2500–3500 m a.s.l. J. Kolibač leg. ( NHMB); 2 ♀♀: Alma-Ata, Chinbulak. 2000–3200 m a.s.l. 10.8.1991. Snižek leg. (cSch); 2 ♂♂: Ili Alatau, Almaty, Big Almaty Lake. 28.06.1991. V. Kashcheev leg. (cSh); 1 ♂, 2 ♀♀: Kegen, Sary-Tau. 1900 m a.s.l. 16.07.1984. V. Kashcheev leg. ( ZIN); 1 ♂, 1 ♀: Trans-Ili Alatau Mts., Kimasar Gorge, 43°09’04’’N 77°06’32’’E. 29.07.2013. Kolov leg. (cKh); 1 ♂, 3 ♀♀: same data, upper reaches of Kazachka River, 43°06`53``N 77 01`24``E. 2800 m a.s.l. (cKh); 1 ♀: same Mts.,Ozyornyi Pass. 03.08.1971. G. Bugayev leg. ( ZMM); JAMBYL: 1 ♂: Aksu-Djabagly, Djabagly River, Kshi-Kaindy. 20.05.1987. V. Kashcheev leg. ( ZIN); KYRGYZSTAN: TALAS: 1 ♂, 1 ♀: Ala-Bell Pass, 42°14’44N 73°03’10E. 3200 m a.s.l. 15.07.2003. G. Müller-Motzfeld leg. ( NME); 8 ♂♂, 9 ♀♀: same data, 42°14’35’’N 73°03’09’’E. 3175 m a.s.l. L. Schmidt leg. ( NME); 2 ♂♂, 2 ♀♀: Talasskiy Alatoo, Otmjok Pass, 42°16’55’’N, 73°10’29’’E. 18.07.2006. 3300 m a.s.l. L. Schmidt leg. ( NME); 3 ♀♀: Otmek mountain pass. 02.07.1997. S.V. Ovchinnikov leg. (cSh); 1 ♂: Kyrgyzskiy Alatau, Tejo Aschun Pass. 3200 m a.s.l. 17.07.1998. G. Müller-Motzfeld leg. (cSh); 4 ♂♂, 3 ♀♀: N slope of Kyrgyzskiy Mts., Chunkurchak River. 3500 m a.s.l. 23– 24.07.1992.A. Klimenko leg. (cSh); 2 ♂♂, 3 ♀♀: same data, Ala-Archa. 2800 m a.s.l. 26– 28.08.1993. A. Klimenko leg. (cSh); CHUI: 2 ♀♀: Chui Tus-Ashuu Pass, 42°21’24’’N 73°48’53’’E. 3100 m a.s.l. 14.07.2003. G. Müller-Motzfeld ( NME); 17 ♂♂, 11 ♀♀: Chui Kirgizskij Alatau - Tejo-Ashuu Pass, 42°21’24’’N 73°48’53’’E. 3125 m a.s.l. 18.07.2006., leg. L. Schmidt leg. ( NME); YISSIK-KOL: 3 ♂♂, 1 ♀: Terskey- Alatoo Mts., N Pass, Chonon Aschuu, 42°23’39``N 79°03’31``E. 3700 m a.s.l. 27.VII. M. Motzfield leg. ( NME); 2 ♂♂, 3 ♀♀: same Mts., Turuk Valley, 42°36’17’’N, 79°18’57’’E. 2600 m a.s.l. 30.07– 01.08.2005. L. Schmidt leg. ( NME); 4 ♂♂, 6 ♀♀: same data, Kai-Bulak Valley, 41°19’55’’N 78°21’05’’E. 3050 m a.s.l. 24.07.2005. ( NME); 1 ♂, 1 ♀: same data, Tschon-Ashuu Pass, 42°23’46’’N, 79°03’15’’E. 3600 m a.s.l. 26.07.2005. ( NME); 3 ♀♀: Enylschek Valley, 42°07’21’’N, 79°20’24’’E. 2650 m a.s.l. 27– 28.07.2005. L. Schmidt leg. ( NME); NARYN: 1 ♂: Inner Tian-Shan, mountains 8–14 km NE lake Son-Kul, ca. 41°52’N 75°21’E. 3100–3600 m a.s.l. 08.1999. Hetzel leg. (cF); 2 ♀♀: Dolon Pass. 2700 m a.s.l. 23– 27.07.1991. S. Becvar leg. ( MHNG); 3 ♂♂: N Kalmak-Ashuu (Pass). 3400 m a.s.l. 31.07.2009. W. Schawaller leg. ( SMNS); JALAL-ABAD: 13 ♂♂, 15 ♀♀: Sary-Chelek Nature Reserve. 20.07.1983. A.B. Ryvkin leg. (cSh, cR, ZMM); 1 ♂: same data, environs of Arkit. Litter in forest with Juglans , Fraxinus , Berberis . 28.09.1983. (cSh); 4 ♂♂, 2 ♀♀: Chatkal Mts., upper flow of Aflatun River. 23.07.2000. V. Gromenko leg. (cSh); OSH: 1 ♀: Osch National Park, Kara Shoro, Uzgenskiy Mts., 40°43’07’’N 73°03’00’’E. 2900 m a.s.l. 20.vii.2003. L. Schmidt leg. ( NME); 1 ♂: Uzun-Akhshat. 13.08.1986. S. Ovchinnikov leg. (cSh); BATKEN: 1 ♂: Kadamjay District, Isfairamsay. 2800 m a.s.l. 14.07.1999. O.O. Novikov leg. (cSh).

Redescription. Measurements (n=500): HW: 0.87–1.02; HL: 0.62–0.77; OL: 0.20–0.27; TL: 0.15–0.26; AL: 2.17–3.22; PL: 0.79–1.00; PWmax: 1.05–1.22; PWmin: 0.78–1.03; ESL: 1.37–1.86; EW: 1.50–1.83; MTbL (averaged): 1.20; MTrL (averaged): 0.42 (MTrL 1–4: 0.21; MTrL 5: 0.21); AW: 1.40–1.96; AedL: 0.73–1.03; BL: 4.50–6.40 (holotype of T. ovchinnikovi : 6.05).

Habitus as in Figs 4–5 . Body brown or reddish-brown, with yellow-brown elytra (mediobasal part of elytra usually darkened); mouthparts, antenna and legs yellowish or yellow-brown; apical maxillary palpomere and tarsi yellow. Head with distinct and irregular microsculpture: dense, fine and transverse on clypeus, finer and sometimes indistinct in middle between eyes, subdiagonal on infraorbital portions, isodiametric, distinctly denser and coarser between ocelli and on mediobasal portion; neck with dense transverse or isodiametric microreticulation; pronotum with dense transverse meshes, coarser in medioapical half and finer in middle, mediobasal portion sometimes without meshes; scutellum with fine transverse microreticulation; abdominal tergites with dense, fine or moderately coarse and transverse microsculpture, sometimes finer in middle part of abdominal tergites VI and VII.

Head 1.3–1.4 times as broad as long, with strongly convex, narrow and elongate supra-antennal prominences, and distinctly convex middle portion at level of anterior margins of eyes and infraorbital portions; anterio-median depression wide and deep, slightly narrowed basad and sometimes connected with narrow and moderately deep subrectangular or subtrapezoidal interocellar depression; anteocellar foveae indistinct or distinct and moderately deep, slightly or strongly convergent latero-anteriad toward level of middle or anterior margin of eyes; temples 1.1–1.3 times as long as longitudinal length of eyes or slightly longer. Ocelli small and sometimes indistinct, located at level of posterior margin of eyes or temples; distance between ocelli about as long as distance between ocelli and posterior margin of eyes, or slightly shorter. Punctation dense, fine or moderately large, finer in middle and larger on infraorbital portions, mediobasal part without distinct punctures; neck without, or with fine and dense punctation. Last maxillary palpomere about as long as preapical segment or indistinctly longer, from widest middle part gradually rounded toward subacute or obtuse apex. Antenna reaching apical third of elytra when reclined, with elongate antennomeres 3–10; basal antennomere wide, about three times as broad as long, antennomere 2 distinctly shorter and narrower than basal antennomere, 3 distinctly longer than 2, 4–10 distinctly shorter and slightly broader than 3, apical antennomere 1.2–1.3 times as long as preapical antennomere, from middle gradually narrowed toward subacute or obtuse apex.

Pronotum 1.2–1.3 times as broad as long, from widest anterior part gradually ( Fig. 4 ) or strongly ( Fig. 5 ) narrowed posteriad toward obtuse hind angles; frontal part slightly or relatively strongly protruded apicad, with widely rounded or distinctly concave apical margin, about as long as or distinctly shorter than somewhat straight posterior margin; laterobasal potions in front of hind angles slightly and widely concave in some specimens; middle portion without or with distinct narrow longitudinal depression; mediobasal portion without or with transverse, shallow or relatively deep depression; lateral margins narrowly bordered; laterobasal portions distinctly and widely depressed. Punctation about as that on head, sometimes slightly larger and deeper, usually finer and sparser in middle; interstices between punctures in middle about as long as diameters of two-three nearest punctures. Scutellum without or with several fine punctures in middle.

Elytra convex or slightly impressed in middle, 1.2–1.3 times as broad as long, slightly or strongly broadened posteriad, 1.7–1.8 times as long as pronotum; lateral margins narrowly impressed and sometimes slightly reflexed in about middle; hind margins straight or widely rounded. Punctation dense, but distinctly larger and deeper than tat on pronotum, finer around scutellum, usually finer and sparser along suture. Hind wings fully developed.

Metatarsus slightly less than three times as long as metatibia; apical metatarsomere as long as preceding four metatarsomeres.

Abdomen slightly narrower or broader than elytra; middle portion of abdominal tergite IV with two transverse and moderately large tomentose spots; middle portion of abdominal tergite V with two small and oval tomentose spots, sometimes invisible in some specimens.

Male. Profemora and protarsomeres 1–4 wide. Posterior margin of abdominal tergite VIII straight or sligthly concave. Posterior margin of abdominal sternite VIII widely concave. Aedeagus with broad basal part and relatively short ( Figs 43, 45 ) or elongate ( Fig. 46 ) median lobe, from apical third sharply narrowed toward subacute or rounded apex; parameres not exceeding or slightly longer than apex of median lobe, narrow, with broadened apical parts, with three to four relatively short apical setae and several short setae along outer margin of preapical and inner margins of middle portions; internal sac narrow, elongate, with fields of fine spines and sclerotized elongate structures in preapical portion, with long flagellum; preapical part of flagellum widely broadened. Lateral aspect of the aedeagus as in Fig. 44 .

Female. Profemora and protarsomeres 1–4 narrow. Posterior margins of abdominal tergite VIII and sternite VIII straigth or somewhat rounded.

Comparative notes. Based on the general shape and the coloration of the body, T. ketmeniensis is somewhat similar to T. schmidti Zerche, 1992 , known from Tajikistan, but differs from it by the presence of the ocelli, shorter antennae, and the morphology of the aedeagus (see details in Zerche (1992)). Based on the general shape of the body and the length of the antennae, it somewhat similar to the Middle Asian T. penicillatus , but can be distinguished from it by the paler coloration, shorter apical maxillary palpomere, somewhat finer microsculpture of the pronotum, and different external and internal structure of the aedeagus.

Distribution. Trichodromeus ketmeniensis is widely distributed in Middle Asia from the north-eastern part of Kazakhstan (Altai Mts.) to southern Kyrgyzstan and eastern Turkmenistan ( Fig. 48 ).

Bionomics. Trichodromeus ketmeniensis can be found under stones and debris or between gravel near streams and rivers at altitudes from 2000 to 3800 m a.s.l. Some specimens were collected by sifting litter in floodplain forest near rivers and under stones near snowfields in the alpine zone.

Remarks. Neogeodromicus ketmeniensis was originally described based on several specimens from “Turkestan, Ketmen-tjube, Sussamir Tan…”. Zerche (1992) synonymized Neogeodromicus Bordoni, 1985 with Trichodromeus , redescribed T. ketmeniensis and provided additional faunistic data from Kazakhstan and Kyrgyzstan. Trichodromeus ovchinnikovi was originally described based on four specimens from Kyrgyzstan. The pronotum of the holotype and one paratype from widest anterior part is sharply narrowed toward relatively narrow basal portion ( Fig. 5 ). I found several specimens from different localities with a similar shape of the pronotum. The external and the internal morphology of the aedeagus of T. ovchinnikovi is similar to some other studied specimens of T. ketmeniensis with elongate and relatively narrow median lobe ( Fig. 46 ). Thus, T. ovchinnikovi was synonymized with the latter species. Morphologically, it is a more variable species of Middle Asia, therefore I decided to redescribe it.

Figures

FIGURE 48. Distribution of Trichodromeus ketmeniensis Bordoni, 1985 in the Middle Asia (black circles: specimens studied by the author; white circles: previously published records, specimens not see nby the author).

FIGURES 1–6. Habitus of Hygrogeus (Fig. 1) and Trichodromeus (Figs 2–6): 1—H. aemulus (Tirol), 2—T. armatus (Kashmir: Baltal), 3—T. armatus (Kashmir: Kolahoi Glacier), 4—T. ketmeniensis (Kyrgyzstan: Chatkal Mts.), 5—T. ovchinnikovi (holotype), 6—T. kumaonensis (paratype). Scale bar: 1.0 mm.

FIGURES 39–46. Aedeagus of Trichodromeus (Figs 39–40: T. armatus (Kashmir: Kolahoi Glacier), Figs 41–42: T. jaegeri (Nepal: Gandaki), Figs 43–46: T. ketmeniensis (Figs 43–44: Kazakhstan, Kulbastau), Fig. 45: Kyrgyzstan, Sary-Chelek, Fig. 46: Kazakhstan, Dolaity): 39, 42, 43, 45–46—parameral view, 40, 42, 44—lateral view. Scale bar: 0.1 mm.