Trichodromeus telnovi, Shavrin, 2024

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 : 28-30

Trichodromeus telnovi sp. n.

( Figs 47 , 51 , 54–55 )

Type material examined. Holotype ♂ ( Fig. 51 ; dissected): ‘ NEPAL W, Karnali Prov., Jumla | Distr., Jumla 13 km NE to 9 km | NNW, 29°23’43’’N 82°8’55’’E to | 29°21’26’’N 82°9’31’’E, 1.vii.2022, | 2770–3550 m, disturbed montane | forest & pastures, leg. D. Telnov | #2022–22 BMNH{E} 2022-117 ’ <printed>, ‘ HOLOTYPE | Trichodromeus | telnovi sp.n. | Shavrin A.V. des. 2024’ ( BMNH).

Description. Measurements: HW: 0.95; HL: 0.70; OL: 0.20; LT: 0.15; AL: 3.60; PL: 0.80; PWmax: 1.10; PWmin: 0.85; ESL: 1.52; EW: 1.69; MTbL: 1.27; MTrL (holotype): 0.55 (MTrL 1–4: 0.30; MTrL 5: 0.25); AW: 1.62; AedL: 1.17; BL: 5.45.

Habitus as in Fig. 43 . Body brown, with slightly paler pronotum, elytra and apical part of abdomen; mouthparts, antennae and legs yellow-brown (preapical maxillary palpomere and basal antennomere slightly darker). Head with distinct microsculpture, transverse on clypeus, subdiagonal on infraorbital portions and indistinct in middle portion between anteocellar foveae, coarser and denser in mediobasal portion and neck; pronotum with isodiametric microreticulation, denser and coarser in medioapical and mediobasal portions and finer in middle; scutellum with fine transverse meshes; abdominal tergites with fine transverse sculpture.

Head 1.3 times as broad as long, with slightly elevated middle and infraorbital portions; anterio-median depression wide and deep, narrowed basad; interocellar depression wide and shallow, subrectangular, with very short anteocellae foveae, each slightly longer than diameter of ocellus; temples 1.3 times as long as longitudinal length of eyes. Ocelli moderately large, located slightly below level of posterior margins of eyes; distance between ocelli slightly shorter than distance between ocellus and posterior margin of eyes. Punctation dense, moderately large and deep, finer on clypeus and in midle portion between eyes; mediobasal portion without distinct punctures; neck with indistinct and moderately sparse fine punctation. Last (apical) maxillary palpomere distinctly longer than preapical segment, from middle gradually narrowed toward subacute apex. Antenna reaching apical third of elytra when reclined, with elongate antennomeres 3–10; antennomeres 3–4 slightly longer and indistinctly narrower than 2, 5–6 indistinctly narrower and broader than 4, 7–9 slightly longer than 6, 10 indistinctly shorter than 9, apical antennomere 1.2 times as long as 10.

Pronotum 1.2 times as broad as long, from widest anterior part gradually narrowed toward obtuse hind angles; frontal part not protruded anteriad, with slightly concave apical margin, slightly shorter than somewhat straight posterior margin; middle portion with distinct, shallow and narrow longitudinal depression, starting from medioapical part and reaching mediobasal portion; mediobasal portion with distinct transverse and moderately deep depression; laterobasal portions widely impressed. Punctation about as than on head, finer and sparser in middle; interstices between punctures in middle about as long as diameters of one-two nearest punctures. Scutellum without distinct punctation.

Elytra slightly broader than long, gradually broadened posteriad, 1.9 times as long as pronotum; lateral margins narrowly impressed; hind margins widely rounded. Punctation about as that on pronotum, but slightly sparser in middle. Hind wings fully developed.

Metatarsus 1.3 times as long as metatibia; apical metatarsomere slightly shorter than preceding four metatarsomeres.

Abdomen slightly narrower 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.

Male. Posterior margin of abdominal tergite VIII rounded. Posterior margin of abdominal sternite VIII widely concave. Aedeagus with broad basal part, gradually narrowed toward wide median lobe, with narrow preapical part, gradually narrowed toward subacute apex; parameres narrow, slightly not reaching apex of median lobe, with slightly broadened apical portions, each with three moderately short apical setae; internal sac wide and long, with two narrow and elongate protrusions in preapical part, with long flagellum, spirally folded in basal part of aedeagus; preapical part of flagellum significantly broadened ( Fig. 54 ). Lateral aspect of the aedeagus as in Fig. 55 .

Female unknown.

Comparative notes. Based on the general shape of the body with the frontal part of the pronotum not protruded apicad and slightly broadened elytra, T. telnovi sp. n. is similar to T. jaegeri (see above) and T. kaliyuga Shavrin, 2021 , but differs from them by the paler coloration, the slightly shorter pronotum, and different external and internal morphology of the aedeagus, with significantly shorter parameres.

Distribution. Trichodromeus telnovi sp. n. is known only from the type locality in western Nepal ( Fig. 47 ).

Bionomics. The type specimen was collected at an elevation from 2770 to 3550 m a.s.l. in disturbed montane forest.

Etymology. Patronymic, the species is named to honour my colleague, Dmitry Telnov (London/ Riga), collector of the holotype.

Figures

FIGURE 47. Distribution of Trichodromeus jaegeri Shavrin, 2021 (circles) and T. telnovi sp. n. (square) in Nepal.

FIGURES 49–51. Habitus of Trichodromeus: 49—T. penicillatus (Kazakhstan: Aksu-Dzhabagly), 50—T. pusillus (Kashmir), 51—T. telnovi (holotype). Scale bar: 1.0 mm.

FIGURES 52–58. Aedeagus of Trichodromeus (Figs 52–53: T. kumaonensis (paratype), Figs 54–55: T. telnovi (holotype), Figs 56–58: T. penicillatus (Figs 56–57: Kazakhstan, Dzhabagly; Fig. 58: Kyrgyzstan, Chakmak): 52, 54, 56, 58—parameral view, 53, 55, 57—lateral view. Scale bar: 0.1 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.