Anthobium denticulatum 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 : 477-478

Anthobium denticulatum Shavrin & Smetana , sp.n.

( Figs. 47 , 54–56 )

Type material examined: Holotype ♂: ‘ NEPAL, D: Kaski, Wl. | Madi Khola valley | above Sikles, 3200m’ <rectangular label, printed>, ‘ 28°22'48''N, 84°03' | 54''E, 13.IX.2013, leg. | [J.] Hagge & [J.] Schmidt’ <rectangular label, printed >, ‘ HOLOTYPE | Anthobium | denticulatum sp.n. | Shavrin A. & Smetana A. des. 2018’ <red rectangular label, printed> ( NME) .

Paratypes (19 specimens): 6 ♂♂ [three specimens dissected], 13 ♀♀: same data as the holotype , ‘ PARATYPE | Anthobium | denticulatum sp.n. | Shavrin A. & Smetana A. 2017 ’ <red rectangular label, printed> (5 ♂, 11 ♀: NME; 1 ♂, 2 ♀: CS) .

Description. Measurements (n=20): HW: 0.55–0.58; HL: 0.33–0.40; AL(holotype): 0.85; OL: 0.12–0.14; PL: 0.42–0.49; PW: 0.78–0.87; ESL: 0.85–0.93; EW: 0.96–1.12; AW: 0.86–0.97; MTbL: 0.45, MTrL: 0.20 (MTrL 1–4: 0.13; MTrL 5: 0.07); AedL: 1.10; TL: 2.30–3.30 (2.70– holotype).

In external appearance similar to A. besucheti . Body and antennomeres 9–11 yellow-brown to reddish brown, with darker head and abdomen in some specimens; mouthparts, antennomeres and legs yellow to yellow-brown. Head with distinct microsculpture, transverse in middle and between ocelli, isodiametric on anterior portions of infraorbital ridges, posterior portions of infraorbital ridges with slightly rugose vertical waves of sculpture; anterior part of middle elevation of pronotum with indistinct transverse meshes in some specimens; scutellum with fine isodiametric microsculpture. Head with irregular small punctation, denser and coarser on posteriolateral portions; pronotum with irregular, large and deep punctation, sparser on lateral portions, with small impunctate area between mediobasal impression in some specimens; apex of scutellum with several small punctures; punctation of elytra as that on pronotum, some specimens with distinctly smaller punctures on parascutellar area and along suture, each elytron with five to eight vague and tangled longitudinal, and with diagonal rows of punctures in some specimens. Habitus as in Fig. 47 .

Head 1.4–1.6 times as wide as long; middle portion of head slightly and irregularly elevated, with indistinct to distinct transverse impression between eyes at posterior third, with narrow grooves in front of ocelli reaching posterior third or middle length of eyes; postocular ridges indistinct, very smooth. Length × width of antennomeres (holotype): 1: 0.12 × 0.06; 2: 0.07 × 0.04; 3: 0.08 × 0.03; 4–7: 0.07 × 0.04; 8: 0.06 × 0.04; 9–10: 0.06 × 0.05; 11: 0.12 × 0.05.

Pronotum 1.7–1.8 times as wide as long, 1.4–1.5 times as wide as head; lateral edges of pronotum with regular, small and smooth crenulation; pronotum usually with deep longitudinal impression in apical part, and with very deep transverse impression in mediobasal third in some specimens.

Elytra 1.1–1.2 times as wide as long, twice as long as pronotum; middle part of each elytron usually with irregular longitudinal elevations between punctures.

Male. Apical margin of abdominal tergite VIII and sternite VIII slightly sinuate. Aedeagus ( Fig. 55 ) with moderately wide median lobe with subtruncate apex; parameres significantly exceeding apex of median lobe, with two apical and two preapical setae; internal sac narrow and long, with rows of sclerotized widened teeth in both middle and basal part. Aedeagus laterally as in Fig. 56 .

Female. Apical margin of abdominal tergite VIII slightly sinuate. Apical margin of abdominal sternite VIII rounded.

Comparative notes. Based on the body size, coloration, shape of the body with moderately short elytra, A. denticulatum Shavrin & Smetana , sp.n. is most similar to A. besucheti Shavrin & Smetana , sp.n., from which it differs by the slightly narrower pronotum, by wider and larger aedeagus, and by the presence of rows of sclerotized teeth in internal sac.

Distribution. The new species is at present known only from the type locality ( Fig. 54 ) in the Madi Khola valley, central Nepal.

Bionomics. Specimens were taken by sifting leaf litter in Rhododendron forest at elevation 3200 m a.s.l. (J. Schmidt, pers. comm.)

Etymology. The specific epithet is the Latin adjective denticulatus, - a, - um (toothed). It refers to lateral rows of sclerotized teeth on the internal sac of the aedeagus.

Figures

FIGURE 54. Distribution of Anthobium altivagans (black circles), A. besucheti (black squares), A. rugosum (black triangles) and A. denticulatum (black star) in the Himalayan Region.

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.

FIGURES 45–49. Habitus of Anthobium fusculum group: 45—A. confucii (paratype; CHINA: Hubei), 46—A. cuccodoroi (paratype), 47—A. denticulatum (paratype), 48—A. laozii (paratype; CHINA: Yunnan, Cangshan), 49—A. latissimum (holotype). Scale bar: 1.0 mm.