Anthobium farkaci Shavrin & Smetana, 2019

Shavrin, Alexey V. & Smetana, Aleš, 2019, A revision of Eastern Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini). III. Consanguineum, crassum and reflexum groups, and an additional species of the fusculum group, Zootaxa 4688 (4), pp. 451-482 : 467-469

Anthobium farkaci Shavrin & Smetana , sp.n.

( Figs. 59 , 64 , 71–72 )

Type material examined: Holotype ♂ [dissected]: ‘ CHINA: W Sichuan | 20 km N Sabdê , 3200 m | 29°35N 102°23 E, 15.VII. | 1998, A. Smetana [C83]’ <rectangular label, printed>, ‘1998 China Expedition | J. Farkač, D. Král, | J. Schneider | & A. Smetana’ <rectangular label, printed >, ‘ HOLOTYPE | Anthobium | farkaci sp.n. | Shavrin A.V. & Smetana A. 2018’ <red rectangular label, printed> ( NSMT) .

Description. Measurements of the holotype: HW: 0.85; HL: 0.45; AL: 1.40; OL: 0.18; PL: 0.65; PW: 1.33; ESL: 1.65; EW: 1.72; AW: 1.70; MTbL: 0.80; MTrL: 0.38 (MTrL 1–4: 0.23; MTrL 5: 0.15); AedL: 0.90; TL: 3.87.

Head and antennomeres 8–11 brown; pronotum, elytra and abdomen reddish-brown; mouthparts, antennomeres 1–7, lateral portions of pronotum, legs and apical tergites of abdomen yellow-brown. Lateral portions of head with distinct diagonal meshes between punctures; abdomen with small isodiametric microsculpture. Head with very irregular fine punctation, markedly denser on infraorbital ridges, only with several fine punctures between grooves in front of ocelli, with wide transverse and diagonal impunctated portions in middle of head; neck with dense, fine and deep punctation; pronotum with very sparse fine punctation, finer and sparser in middle and sparser on lateral portions; scutellum without visible punctures; punctation of elytra moderately sparse and fine, markedly larger than that on pronotum, denser and finer on parascutellar portion and along suture, punctures on each elytron tangled, forming very indistinct three to four longitudinal rows in middle. Habitus as in Fig. 59 .

Head 1.8 times as wide as long; middle portion and infraorbital ridges slightly elevated, with moderately wide impression between elongate and deep grooves in front of ocelli, reaching middle level of eye; postocular ridge smooth. Ocelli situated at level slightly behind of postocular ridges. Length × width of antennomeres: 1: 0.18 × 0.10; 2: 0.15 × 0.06; 3: 0.12 × 0.05; 4–0.10 × 0.06; 5–6: 0.11 × 0.06; 7: 0.11 × 0.07; 8–9: 0.10 × 0.07; 10: 0.10 × 0.08; 11: 0.22 × 0.08.

Pronotum about twice as wide as long, 1.5 times as wide as head; posterior angles moderately obtuse; lateral margins with irregular and very indistinct projections, with additional small crenulation on edges; distinctly elevated middle portion without longitudinal impression, with indistinct, wide, paired impressions on mediobasal third.

Elytra as that in A. crassum sp.n., but slightly less convex, reaching basal margin of abdominal tergite V; lateral portions moderately wide, slightly explanate; surface of each elytron with indistinct longitudinal elevation between punctures, stretching from shoulders diagonally to apical third.

Male. Apical margins of abdominal tergite VIII slightly and sternite VIII deeply emarginated. Aedeagus ( Fig. 71 ) large, with very wide basal portion, gradually narrowed toward narrow, subtruncate apex; parameres short, wide, moderately exceeding apex of median lobe, with seven short apical, and one preapical setae; internal sac moderately wide, very long, spirally rolled in basal portion. Aedeagus laterally as in Fig. 72 .

Female unknown.

Comparative notes. Anthobium farkaci sp.n. differs from the remaining species of the crassum -group by the smaller and sparser punctation of pronotum and elytra, narrower pronotum, and by details of external and internal characters of the aedeagus.

Distribution. The species is known only from the type locality near Sabdê, Sichuan, China ( Fig. 64 ).

Bionomics. The holotype was collected at elevation 3200 m a.s.l. in soaking wet moss in forest seepage in an old mixed forest ( Abies , Pinus , Betula , Populus ).

Etymology. Eponymic, the species is named to honor our colleague Jan Farkač (Prague, Czech Republic), one of the collectors of the holotype.

Figures

FIGURE 64. Distribution of Anthobium crassum (black circles), A. crenulatum (black square), A. explanatum (black rhomb), and A. farkaci (black triangle) in the south-western China.

FIGURES 56–59. Habitus of species of Anthobium crassum-group: 56—A. crassum (holotype), 57—A. crenulatum (holotype), 58—A. explanatum (holotype), 59—A. farkaci (holotype). Scale bar: 1.0 mm.

FIGURES 69–72. Aedeagus of Anthobium explanatum (69–70: paratype) and A. farkaci (71–72: holotype): 69, 71—parameral view, 70, 72—lateral view. Scale bar: 0.1 mm.