Trichodromeus jaegeri Shavrin, 2021

Shavrin, Alexey V., 2021, Four new species of the genus Trichodromeus Luze, 1903 from Nepal and Pakistan (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), Zootaxa 4991 (2), pp. 353-362 : 357-359

Trichodromeus jaegeri Shavrin , sp.n.

( Figs. 2 , 7–8 , 11 )

Type material examined: Holotype, ♂ [dissected]: ‘ NEPAL, Dhaulagiri-Himal | Kali Gand. vall., Yak Kharkra |

(upp. Marpha), 41–4600m, | 12./ 13.VII.1998, leg. Jäger’ <printed>, ‘ HOLOTYPE | Trichodromeus | jaegeri sp.n. | Shavrin A. V. des. 2021’ <red, printed> ( SNSD).

Paratype: 1 ♂, 1 ♀: same data as the holotype (1 ♂: CS, 1 ♀: SNSD); 3 ♀♀: ‘ NEPAL Dhaulagiri | upp. Yak- kharka | 41-4500m 12.7.[19]98 | lg.Berndt & Schmidt’ <printed>, ‘Ankauf A. Dobbertin | Rostock, 2001 | Museum Dresden’ <printed> (1 ♀: CS; 2 ♀♀: SNSD). All paratypes with red printed label: ‘ PARATYPE | Trichodromeus | jaegeri sp.n. | Shavrin A. V. des. 2021’.

Description. Measurements (min-max; n=6): HW: 1.10–1.22; HL: 0.77–0.82; OL: 0.25–0.27; LT: 0.24–0.25; AL (holotype): 3.40; PL: 1.00–1.10; PWmax: 1.12–1.37; PWmin: 0.98–1.18; ESL: 1.67–2.21; EW: 1.75–2.28; MTbL (holotype): 1.46; MTrL (holotype): 0.55 (MTrL 1–4: 0.28; MTrL 5: 0.27); AW: 1.75–2.01; AedL: 1.05; BL: 5.35 (holotype)–7.60.

Body and antennomeres brown to black; mouthparts and legs brown; tarsi and sometimes apical segment of maxillary palpi and tibia (one paratype) yellow-brown. Head with distinct microreticulation: fine and isodiametric in middle, transverse on infraorbital ridges; neck with dense and coarse isodiametric microsculpture; pronotum with very dense and fine, transverse microreticulation, usually denser and coarser in mediobasal portion; scutellum with dense transverse meshes. Habitus as in Fig. 2 .

Head 1.4 times as broad as long, with distinctly elevated middle part and portions between ocelli and eyes; anterio-median depression deep, gradually narrowed and extended basad and narrowly connected with interocellar depression; temples convex, about as long as longitudinal length of eyes; interocellar depression deep, somewhat subrectangular, separated from infraorbital ridges by deep, distinctly convergent latero-anteriad anteocellar foveae, reaching level of middle or apical third of eyes. Ocelli small, located slightly below level of posterior margin of eyes, distance between ocelli about as long as distance between ocellus and posterior margin of eye or slightly shorter. Punctation moderately large and deep, irregular, finer in middle and denser in infraorbital ridges. Antennae exceeding middle of apical third of elytra when reclined; basal antennomere wide, more than twice as long as broad, antennomere 2 significantly narrower and shorter than basal antennomere, 3 distinctly longer and narrower than 2, 4–8 slightly broader than 3, 9–10 slightly broder than 8.

Pronotum convex, 1.1–1.2 times broader than long and slightly broader than head, with widely rounded anterior angles not protruded apicad; widest anterior portion gradually narrowed toward obtuse posterior angles; anterior margin rounded; posterior margin straight; middle portion with moderately wide logitudinal depression, connected with indistinct transverse mediobasal depression in some specimens. Punctation regular, about as that on head, but slightly finer.

Elytra convex, about as broad as long, slightly widened posteriad. Punctation about as that on pronotum, but somewhat larger and denser.

Abdomen about as broad as elytra or slightly narrower.

Male. Apical margin of abdominal tergite VIII straight or rounded. Apical margin of abdominal sternite VIII slightly concaved. Median lobe wide, from widest apical third gradually narrowed toward moderately narrow subtriangular apical portion with small, rounded apex; parameres slightly exceeding apex of median lobe, with two moderately long apical and two short preapical setae ( Fig. 9 ). Lateral aspect of aedeagus as in Fig. 10 .

Female. Apical margins of abdominal tergite VIII and sternite VIII rounded.

Comparative notes. Based on the general shape of the body, T. jaegeri sp.n. is similar to T. trilobatus sp.n. and T. kaliyuga sp.n., from which it can be distinguished by the different shape of the apical portion of the median lobe. Additionally, it differs from T. trilobatus sp.n. by the paler coloration and from T. kaliyuga sp.n. by the larger and somewhat wider elytra and shorter parameres.

Distribution. The species is known only from the type locality in the central Nepal ( Fig. 11 ).

Etymology. The species is dedicated to Olaf Jäger (Dresden), one of the collectors of the type material.

Figures

FIGURE 11. Distribution of Trichodromeus in Nepal: T. acutipenis (circles), T. jaegeri (square), T. kaliyuga (triangle).

FIGURES 1–4. Habitus of Trichodromeus: 1—T. acutipenis (holotype), 2—T. jaegeri (paratype), 3—T. kaliyuga (holotype), 4—T. trilobatus (paratype). Scale bar: 1.0 mm.

FIGURES 5–10. Aedeagus of Trichodromeus (5–6: T. acutipenis (holotype), 7–8: T. jaegeri (holotype), 9–10: T. kaliyuga (holotype): 5, 7, 9–parameral view, 6, 8, 10 lateral view. Scale bar: 1.0 mm.