Anthobium rugosum ( Champion, 1925 )

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 : 488-489

Anthobium rugosum ( Champion, 1925)

( Figs. 54 , 76 , 84–85 )

Lathrimaeum rugosum Champion, 1925: 103

Lathrimaeum rugosum: Cameron, 1930: 154 ; Scheerpeltz, 1933: 1056; Coiffait, 1977: 244

Lathrimaeum (Lathrimaeum) rugosum: Scheerpeltz, 1961: 85

Anthobium rugosum: Herman, 2001: 238

Anthobium (Anthobium) rugosum: Smetana, 2004: 239 ; Schülke & Smetana, 2015: 307

Type material examined: Holotype of Lathrimaeum rugosum Champion, 1925 [Immature specimen, without abdomen from tergites/sternites V] unsexed: ‘U. Gumti Val. | W. Almora Dn. | Apr.`19. H.G.C.’ <rectangular printed label>, ‘2836’ <rectangular printed label>, ‘Type | H. T.’ <round printed label with red margin>, ‘ Lathrimaeum | rugosum, | Champ.’ <rectangular printed label>, ‘E. M. M. 1925. | det. G.C.C.’ <rectangular printed label>, ‘ Lathrimaeum | rugicolle [sic!] | 1925 Ch. | Type’ <rectangular label, handwritten in black Indian ink>, ‘G.C. Champion | Brit. Mus. | 1925–42.’ <rectangular printed label>, ‘ HOLOTYPE | Lathrimaeum | rugosum Champion 1925 | det. R.G. Booth 2015 [printed]’ <rectangular label, handwritten in black>, ‘ Anthobium | rugosum ( Champion, 1925) | Shavrin A.V. det. 2016’ (BMNH).

Additional material: INDIA: Punjab Province: 1 ♀: ‘Parbatti V. | Kulu. Punjab. | 6-8,000ft. H.G.C’, ‘H.G. Champion Coll. | B.M. 1953-156’, ‘ Lathrimaeum ? rugosum Champ. P.M.Hammond det. 1969’ (BMNH); NEPAL: 1 ♂, 1 ♀: W Dhaulagiri, river below Thankur, 28°37'25''N 83°00'32''E. 2800 m a.s.l. J. Schmidt leg. (NME, CS).

Redescription. Measurements (n=4): HW: 0.60; HL: 0.33–0.40; AL(holotype): 0.98; OL: 0.15–0.17; PL: 0.42–0.50; PW: 0.90–0.95; ESL: 1.21–1.25; EW: 1.16–1.22; AW: 0.95–1.05; MTbL(holotype): 0.55, MTrL(holotype): 0.30 (MTrL 1–4: 0.20; MTrL 5: 0.10); AedL: 0.43; TL: 2.65–2.75 (holotype without abdomen: 2.25).

Body moderately wide, subconvex. Head, antennomeres 4–11, middle portion of pronotum, visible part of scutellum and abdomen reddish brown; apical and basal margins and lateral portions of pronotum and elytra yellow-brown; mouthparts, antennomeres 1–3, legs and apical part of abdomen yellow. Infraorbital ridges with moderately strong sculpture and small elevated wrinkles between punctures, more rugose on posterior portions, with small diagonal impunctate areas behind middle impression; middle part of neck with distinct, dense microsculpture; scutellum with indistinct wavy meshes; abdomen with fine isodiametric microsculpture. Head with irregular, moderately large and deep microsculpture, denser on infraorbital ridges of head; middle part of neck with dense small punctures; pronotum with irregular punctation, markedly larger and deeper than that on head, sparser on lateral portions and basal margin and markedly sparser and smaller on mediobasal third, with impunctate small area between impression in some specimens; scutellum with several small punctures; punctation of elytra as that on pronotum, distinctly denser and smaller on parascutellar area, each elytron with six to eight vague and tangled longitudinal rows of punctures; abdominal tergites without punctation. Habitus as in Fig. 76 .

Head 1.5–1.8 times as wide as long; middle portion slightly elevated, with deep transverse impression between eyes at posterior third, with long and deep grooves in front of ocelli, reaching apical third of eye; postocular ridges smooth; anterior portion between antennal insertion and anterior margin of eye with wide and moderately deep notch. 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 about two and half as long as preceding segment. Antenna slightly exceeding shoulders of elytra when reclined; length × width of antennomeres (holotype): 1: 0.17 × 0.06; 2: 0.07 × 0.05; 3: 0.10 × 0.03; 4–6: 0.08 × 0.04; 7–9: 0.07 × 0.05; 10: 0.07 × 0.07; 11: 0.12 × 0.07.

Pronotum transverse, about twice as wide as long, 1.5 times as wide as head, widest in middle, slightly more narrowed posteriad than anteriad; apical margin slightly narrower than posterior margin; anterior angles strongly protruded anteriad; posterior angles obtuse; lateral edges of pronotum with irregular smooth crenulation; pronotum with wide, slightly elevated middle portion, with wide, indistinct longitudinal impression on medioapical third and a pair of moderately deep semioval impressions on mediobasal third.

Elytra about as long as wide, about two and half times as long as pronotum or slightly longer, slightly widened apicad, reaching abdominal tergite V; surface between punctures on medioapical and middle portions of each elytron with irregular, transverse and diagonal elevations.

Male. Apical margin of abdominal tergite VIII widely rounded. Apical margin of abdominal sterbite VIII slightly sinuate. Aedeagus ( Fig. 84 ) short, median lobe with widely rounded apex; parameres short, moderately wide, slightly exceeding apex of median lobe, with two small apical and preapical setae; internal sac narrow, moderately long. Aedeagus laterally as in Fig. 85 .

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

Comparative notes. Anthobium rugosum may be distinguished from all remaining species of the fusculum group by the characteristic rugose surface on middle portion of elytra, with irregular transverse and diagonal elevations between punctures and by the internal and external structures of the aedeagus.

Distribution. The species is known from Punjab and Uttarakhand of India and from central Nepal ( Fig. 54 ).

Bionomics. Specimens were collected at elevations from 1800 to 2800 m a.s.l. Specimens from Nepal were taken by sifting leaf litter in mixed forest near river bank (J. Schmidt, pers. comm.). Champion (1925) noted that the type specimen was collected in dead leaves.

Remarks. Smetana (2004) and Schülke & Smetana (2015) cited the species only from Nepal.

Anthobium rugosum is here recorded for the first time from Punjab State of India.

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 74–78. Habitus of Anthobium fusculum group: 74—A. liliputense (paratype), 75—A. monticola (NEPAL: Lamjung), 76—A. rugosum (NEPAL: Dhaulagiri), 77—A. sociale (INDIA: Uttarakhand), 78—A. splendidulum (CHINA: Yunnan, Gaoligong Shan). Scale bar: 1.0 mm.

FIGURES 84–87. Aedeagus of Anthobium rugosum (84–85: NEPAL: Dhaulagiri) and A. sociale (86–87: NEPAL: Ghoropani Pass): 84, 86—parameral view, 85, 87—lateral view. Scale bar: 0.1 mm.