Anthobium capitale Shavrin & Smetana, 2018

Shavrin, Alexey V. & Smetana, Aleš, 2018, A revision of Eastern Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini). II. fusculum group, and two additional species of the nigrum group, Zootaxa 4508 (4), pp. 451-506 : 467-469

Anthobium capitale Shavrin & Smetana , sp.n.

( Figs. 4 , 57–59 )

Type material examined: Holotype ♂ [specimen dissected]: ‘ CHINA: N-Yunnan Diqing Tibet | Aut.Pr.Deqin Co. Meli Xue | Shan E-side 14km W Deqin | 28°27.47'N 98°46.35'E 2580m | 11.VI.2005 A.Smetana [C158]’ <rectangular label, printed >, ‘ HOLOTYPE | Anthobium | capitale sp.n. | Shavrin A. & Smetana A. des. 2018’ <red rectangular label, printed> ( NSMT) .

Paratype ♀: same data as the holotype , ‘ PARATYPE | Anthobium | capitale sp.n. | Shavrin A. & Smetana A. des. 2018’ <rectangular label, printed> ( CS) .

Description. Measurements (n=2): HW: 0.62–0.65, HL: 0.42; AL(holotype): 1.05; OL: 0.17; PL: 0.50; PW: 0.97; ESL: 1.37; EW: 1.27–1.30; AW: 1.06–1.17; MTbL(holotype): 0.67, MTrL(holotype): 0.35 (MTrL 1–4: 0.23; MTrL 5: 0.12); AedL: 0.68; TL: 2.85(holotype)–2.95.

Body moderately elongate, subconvex. Head reddish brown; pronotum, elytra and abdomen yellow-brown; antennomeres 5–11 brown; mouthparts, antennomeres 1–4 and legs yellow. Head between supra-antennal elevation and anterior margin of eye with diagonal wavy meshes and coarse sculpture on posterior portion between eyes and ocelli; middle part of neck and abdominal tergites with distinct isodiametric microsculpture. Head with irregular, small and moderately deep punctation, markedly coarser on posterior portions of infraorbital ridges; middle part of neck with small, more or less regular punctation, markedly coarser near occipital furrow; pronotum with irregular, large and deep punctation, denser on apical half of middle elevation, sparser laterally, smaller along mediobasal margin, with small impunctate area between mediobasal impression; punctation of elytra dense and deep, smaller on parascutellar area and along suture, each elytron with six vague and tangled longitudinal rows of punctures, remaining elytral punctures forming very indistinct diagonal rows and becoming irregularly scattered laterally; abdominal tergites with indistinct, sparse and small punctation. Habitus as in Fig. 4 .

Head 1.4–1.5 times as wide as long; middle portion of head slightly and irregularly elevated, with middle transverse triangular impression between eyes at posterior third, with narrow grooves in front of ocelli, reaching about middle length of eyes or slightly shorter (holotype); postocular ridges smooth; anterior portion of head between antennal insertion and anterior margin of eye with uneven, semicircular notch slightly deeper apically. Ocelli very large, situated at level of postocular ridges; distance between ocelli slightly longer than distance between ocellus and posterior margin of eye. Apical segment of maxillary palp two and half times as long as preceding segment, widest in basal part, gradually narrowed apicad. Antenna reaching anterior third of elytra when reclined, with antennomeres gradually widened apicad; length × width of antennomeres (holotype): 1: 0.12 × 0.06; 2: 0.10 × 0.05; 3: 0.11 × 0.04; 4–5: 0.10 × 0.05; 6: 0.09 × 0.05; 7–8: 0.08 × 0.05; 9: 0.08 × 0.06; 10: 0.07 × 0.06; 11: 0.12 × 0.06.

Pronotum slightly less than twice as wide as long, 1.5 times as wide as head, widest at middle, slightly more narrowed posteriad than anteriad; apical margin as wide as posterior margin; anterior angles moderately rounded, not protruded anteriad; posterior angles obtuse; lateral edges of pronotum with irregular, smooth crenulation; pronotum with very wide, markedly elevated middle portion, with indistinct (holotype) to distinct longitudinal impression on apical part of middle elevation, with deep and wide semioval impression on mediobasal third.

Elytra longer than wide, distinctly less than three times as long as pronotum, slightly widened apicad, reaching basal margin of abdominal tergite V; each elytron in middle with irregular, longitudinal elevations between third to sixth longitudinal row of punctures, small parascutellar area of each elytron slightly convex.

Male. Apical margin of abdominal tergite VIII straight. Apical margin of abdominal sternite VIII slightly sinuate. Aedeagus ( Fig. 57 ) elongate, with widely trucated apex; parameres significantly exceeding apex of median lobe, with two very short apical and preapical setae; internal sac narrow and long, with two characteristic lateral rows of large sclerotized teeth. Aedeagus laterally as in Fig. 58 .

Female. Apical margin of abdominal tergite VIII straight. Apical margin of abdominal sternite VIII rounded.

Comparative notes. Anthobium capitale Shavrin & Smetana , sp.n. differs from remaining species of the monticola group by the elytra slightly longer than wide, as well as by the shape and internal structure of the aedeagus.

Distribution. The new species is at present known only from the type locality ( Fig. 59 ) in the Meili-Xue Shan range in Yunnan, China.

Bionomics. Specimens were taken by sifting wet leaf litter, debris and moss on and around small seepages and on edges of a small creek in a mixed broadleaved forest (locality: C158).

Etymology. The specific epithet is the Latin adjective capitalis, - e (concerning the head). It brings attention to the fact that the head is of different colour.

Figures

FIGURE 59. Distribution of Anthobium capitale (black circles), A. laozii (black squares) and A. latissimum (black triangle) in Yunnan, China.

FIGURES 1–5. Habitus of Anthobium fusculum group: 1—A. fusculum (KAZAKHSTAN: Tian Shan), 2—A. altivagans (NEPAL: Telbrung Danda), 3—A. besucheti (paratype: Ghoropani Pass), 4—A. capitale (holotype), 5—A. cavicrus (NEPAL: Thare Pati). Scale bar: 1.0 mm.

FIGURES 55–58. Aedeagus of Anthobium denticulatum (55–56: paratype) and A. capitale (57–58: holotype): 55, 57—parameral view, 56, 58—lateral view. Scale bar: 0.1 mm.