Anthobium vitreum, Shavrin, 2022

Shavrin, Alexey V., 2022, A revision of Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae Omaliinae: Anthophagini). V. Algidum, morosum and tectum groups, a new species of the fusculum group, and faunistic records, Zootaxa 5104 (3), pp. 301-346 : 336-339

Anthobium vitreum sp. n.

( Figs. 93 , 97 , 103–104 )

Type material examined: Holotype ♂ [dissected]: ‘ NEPAL Kaski 11/ 12.IX.2013 | env. Kiru Pass 3800-4200m | leg. Hagge & Schmidt | 28°24’N 84°03’E’ <printed>, ‘ HOLOTYPE | Anthobium | vitreum sp. n. | Shavrin A.V. des. 2022’ <red, printed> ( NME).

Description. Measurements: HL: 0.40; HW: 0.60; AL: 1.13; OL: 0.17; PL: 0.52; PW: 0.85; ESL: 1.27; EW: 1.25; AW: 1.11; MTbL: 0.60; MTrL: 0.32 (MTrL 1–4: 0.20; MTrL 5: 0.12); AedL: 0.47; TL: 3.10.

Habitus as in Fig. 97 . Head, maxillary palpomeres, antennomeres 4–11, pronotum and abdomen dark-brown; lateral portions of pronotum and elytra yellow-brown; mouthparts and legs yellow. Head with dense and transverse microsculpture on vertex, with sparse and fine isodiametric meshes in middle and dense, diagonal microreticulation on infraorbital ridges, inner sides of moderately wide longitudinal portions in middle along anteocellar foveae without sculpture; neck with very fine transverse microreticulation; pronotum without microsculpture except for mediobasal portion with indistinct transverse meshes; scutellum without sculpture; abdomen with distinct and transverse microreticulation. Head with fine and sparse punctation on vertex, moderately large and deep in middle, dense and coarse on infraorbital ridges; neck with sparse and fine punctation; pronotum with dense punctation, coarser and deeper than than in middle of head, sparser in middle; elytra with punctation, about as that on pronotum, denser in parascutellar portion, finer in middle; abdominal tergites with very fine and sparse punctation.

Head 1.5 times as broad as long, with deep, narrow and moderately long anteocellar foveae, reaching level of apical third of eye; postocular ridges obtuse. Apical segment of maxillary palpomere about twice and a half as long as preceding segment. Antennomere 3 slightly longer and narrower than 2, 4 distinctly shorter and slightly broader than 3, 5–6 slightly broader than 4, 7 broader than 6, 8 slightly shorter than 7, 9–10 transverse, shorter than 8, apical antennomere about as long as two preceding antennomeres, from apical third gradually narrowed toward rounded apex.

Pronotum 1.6 times as broad as long, twice as broad as head, from widest middle evenly narrowed both anteriad and posteriad; anterior angles not protruded anteriad; mediobasal third with indistinct semicircular impression.

Elytra slightly longer than broad, distinctly more than twice as long as pronotum, with rounded apical margins.

Male. Apical margins of abdominal tergite VIII and sternite VIII sinuate. Aedeagus with moderately wide basal bulb, gradually narrowed toward wide and truncate apex; parameres significantly exceeding apex of median lobe, with very wide apical portions and two short apical setae; internal sac long, spirally folded in basal portion ( Fig. 103 ). Lateral aspect of aedeagus as in Fig. 104 .

Female unknown.

Comparative notes. Regarding the general shape of the body, A. vitreum sp. n. is similar to A. smetanai sp. n., from which it differs by the darker pronotum, shorter antennomeres 4–10, and the shape of the aedeagus. It can be distinguished from other species of the tectum group by long parameres with very wide apical portions.

Distribution. The species is at present known only from the type locality in central Nepal ( Fig. 93 ).

Natural history. The specimen was collected at an elevation of 3800-4200 m a.s.l. Detailed ecological data are unknown.

Etymology. The specific epithet (Latin, adjective: shiny) refers to the shiny body.

Figures

FIGURE 93. Distribution of Anthobium in China and Nepal: A. cornatipenis (black circle), A. himalayense (black star), A. infractum (white square), A. morosum (white star), A. multipunctatum (white circle), A. smetanai (black square), A. umbrinum (black triangle), A. vitreum (black diamond).

FIGURES 94–98. Habitus of species of the Anthobium tectum group: 94—A. smetanai (holotype), 95—A. tichomirovae (holotype), 96—A. umbrinum (holotype), 97—A. vitreum (holotype), 98—A. infractum (holotype). Scale bar: 1.0 mm.

FIGURES 99–104. Aedeagus of Anthobium tichomirovae (Figs. 99–100; holotype), A. umbrinum (Figs. 101–102; holotype) and A. vitreum (Figs. 103–104; holotype): 99, 101, 103—parameral view, 100, 102, 104—lateral view. Scale bar: 0.1 mm.