Omaliopsis amplimaculata Shavrin, 2019

Shavrin, Alexey V., 2019, Three new species and a new combination in the genus Omaliopsis Jeannel, 1940 (Coleoptera: Staphylinidae: Omaliinae: Omaliini) of China and Nepal, Zootaxa 4603 (2), pp. 354-364 : 355-358

Omaliopsis amplimaculata Shavrin , sp.n.

( Figs. 1 , 5–6 , 13–14 , 22 )

Type material examined: Holotype Ƌ [specimen dissected]: ‘ CHINA Sichuan | Emei Shan , 3000m | 29°32N 103°21E | 17–19.VII.1996 C66’ <rectangular label, printed>, ‘collected by | A. Smetana, J. Farkač | and P. Kabátek’ <rectangular label, printed >, ‘ HOLOTYPE | Omaliopsis | amplimaculata sp.n. | Shavrin A.V. des. 2019’ <red rect- angular label, printed> ( NSMT) .

Description. Measurements (n=1): HW: 0.55; HL: 0.37; AL: 0.70; OL: 0.10; TL: 0.02; PL: 0.46; PW: 0.67; ESL: 0.91; EW: 0.86; AW: 0.81; MTbL: 0.50; MTrL: 0.26 (MTrL 1–4: 0.10; MTrL 5: 0.16); AedL: 0.62; BL: 3.14. Habitus as in Fig. 1 .

Body reddish-brown; each elytron with wide yellow-brown macula stretching from lateroapical portion to middle and narrowing from middle toward suture and apical margin of elytron; apical maxillary palpomere and narrow apical margins of tergites reddish; antennomeres 1–5, mouthparts and legs yellow; antennomeres 6–11 brown. Punctation of head irregular, dense, large and moderately deep, markedly sparser between grooves and posterior portions of infraorbital ridges; neck with several small and deep punctures; punctation of pronotum somewhat denser, larger and deeper than that on head, distinctly sparser on anterior and basal portions; scutellum impunctate, only with two very small punctures near apex; elytra with dense and deep punctation, but somewhat smaller than that on pronotum, smaller and coarser near apex; abdominal tergites with moderately regular and very small sparse punctures, indistinct on tergite VII. Forebody glossy; anterior and middle portions of head and neck with transverse and infraorbital ridges with diagonal distinct microsculpture; pronotum with cellular microsculpture, more distinct on mediobasal portion; scutellum with small and dense, transverse meshes; elytra without microsculpture; abdominal tergites with very dense and small, moderately coarse sculpture. Anterior and posterior portions of head with moderately long setation; lateroapical margins and medioapical portions of pronotum with several semierect setae; lateral margins and disc of each elytron with very sparse semierect setae; abdominal tergites with moderately dense and long setation; anterior and posterior margins of pronotum and posterior margins of each elytron with row of very short cuticular fringe.

Head 1.4 times as broad as long, with slightly elevated frons and vertex, with very short temples, with small and deep grooves beginning from anterior parts of each ocellus and stretching to level of posterior margins of eyes. Eyes moderately large, convex; postocular ridges distinct, obtuse. Ocelli moderately large and convex, distance between ocelli about as long as distance between ocellus and posterior margin of eye. Maxillary palpi moderately narrow, palpomere IV (apical) slightly more than three times as long as small and slightly transverse penultimate segment. Antennae short, reaching posterior margin of pronotum when reclined; apical six antennomeres with strong pubescence; antennomeres with lengths × widths (holotype): 1: 0.10 × 0.05; 2: 0.06 × 0.04; 3–4: 0.06 × 0.03; 5: 0.04 × 0.04; 6–7: 0.06 × 0.06; 8–10: 0.06 × 0.07; 11: 0.11 × 0.07.

Pronotum slightly convex, 1.4 times as broad as long, 1.2 times as broad as head, widest in anterior third, gradually rounded anteriad and slightly narrowing toward obtuse posterior angles; lateral margin narrowly marginated; surface of disc with two indistinct very wide longitudinal and laterobasal portions of pronotum with moderately deep oval depressions.

Elytra slightly longer than wide, about twice as long as pronotum, somewhat parallel-sided in anterior half and middle, and slightly widened in posterior portion; lateral margins distinctly marginated; hind margin of elytra somewhat straight. Wings fully developed.

Posterior tarsi about twice shorter than metatibia; apical metatarsomeres markedly longer than four preceding tarsomeres.

Abdomen convex, slightly narrower than elytra, with two small oval wing-folding patches (tomentose spots) on abdominal tergite IV and indistinct narrow palisade fringe on apical margin of abdominal tergite VII.

Male. Apical margin of abdominal tergite VIII ( Fig. 5 ) straight. Apical margin of abdominal sternite VIII ( Fig. 6 ) distinctly emarginated. Aedeagus ( Fig. 13 ) with moderately wide basal portion narrowing toward parallel-sided elongate median lobe with small rounded apex; parameres moderately narrow, slightly exceeding apex of median lobe, with slightly widened apex bearing two apical and two preapical setae, with several additional very small setae along almost entire length of inner edge; internal sac long and complicated, with paired fields of apical and additional pair of elongate sclerotized thorns, and with wide field of moderately large medial thorns. Aedeagus laterally as in Fig. 14 .

Female unknown.

Comparative notes. Based on the shape of the forebody, presence of pale maculae on the elytra and absence of medial teeth on the abdominal sternite VIII of male, O. amplimaculata sp.n. is most similar to Chinese O. bimaculata sp.n., from which it differs by more convex pronotum and elytra, paler legs and antennomeres 1–5, markedly wider maculae on the elytra, elongate antennomeres 6–10, distinctly narrower median lobe of the aedeagus, and details of the internal sac.

Distribution. The new species is at present known only from the type locality ( Fig. 22 ) in the Emei Shan range in Sichuan, China.

Bionomics. The specimen was collected at an elevation of 3000 m a.s.l., in yellow pan traps in a mixed broadleaved forest (locality: C66).

Etymology. The specific epithet is the Latin amplimaculatus, - a, - um (with wide spots). It refers to the presence of wide macula on each elytron.

Figures

FIGURE 22. Distribution of Omaliopsis in Asia: O. amplimaculata sp.n (white circle), O. bimaculata sp.n. (black circle), O. himalayica (Cameron, 1924) (black square), O. musaphila (Rougemont, 2017) (white square), O. schmidti sp.n. (black triangle).

FIGURES 1–4. Habitus of Omaliopsis: 1–O. amplimaculata sp.n. (holotype), 2—O. bimaculata sp.n. (paratype), 3—O. musaphila (Rougemont, 2017) (China: Jinggangshan), 4—O. schmidti sp.n. (paratype). Scale bar: 1.0 mm.

FIGURES 5–12. Abdominal segments of males of Omaliopsis (5–6—O. amplimaculata sp.n., 7–8—O. bimaculata sp.n., 9–10—O. musaphila (Rougemont, 2017), 11–12—O. schmidti sp.n.): 5, 7, 9, 11—tergite VIII (dorsal view), 6, 8, 10, 12—sternite VIII (ventral view). Scale bar: 0.1 mm.

FIGURES 13–17. Aedeagus of Omaliopsis (13–14—O. amplimaculata sp.n. (holotype), 15–17—O. bimaculata sp.n. (15— holotype, 16–17—paratype): 13, 15–16—parameral view, 14, 17—lateral view. Scale bar: 0.1 mm.