Omaliopsis bimaculata 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 : 358-361

publication ID	https://doi.org/ 10.11646/zootaxa.4603.2.8
publication LSID	lsid:zoobank.org:pub:F8A38C56-7B3F-4FC3-981F-C5B092B01084
persistent identifier	https://treatment.plazi.org/id/B22387EF-FFF6-FF97-A48E-FC83BB2EFBC0
treatment provided by	Plazi
scientific name	Omaliopsis bimaculata Shavrin
status	sp. nov.

Treatment

Omaliopsis bimaculata Shavrin View in CoL , sp.n.

( Figs. 2 View FIGURES 1–4 , 7–8 View FIGURES 5–12 , 15–17 View FIGURES 13–17 , 22 View FIGURE 22 )

Type material examined: Holotype Ƌ [specimen dissected]: ‘ CHINA: N-Yunnan Diqing Tibet | Aut.Pr.Zhongdian Co. Xue Shan | nr.lake, 23km S Zhongdian | 27°37.1’N 99°36.5’E 3850m | 6. VI GoogleMaps .2005 A. Smetana (C153a)’ <rectan- gular label, printed>, ‘ HOLOTYPE | Omaliopsis | bimaculata sp.n. | Shavrin A.V. des. 2019’ <red rectangular label, printed> ( NSMT) .

Description. Measurements (n=3): HW: 0.53–0.55; HL: 0.32–0.35; AL (holotype): 0.54; OL: 0.12–0.00; TL: 0.03–0.05; PL: 0.46–0.48; PW: 0.65–0.66; ESL: 0.87–0.95; EW: 0.86–0.87; AW: 0.82–0.86; MTbL (holotype): 0.52; MTrL (holotype): 0.26 (MTrL 1–4: 0.09; MTrL 5: 0.17); AedL: 0.56; BL: 2.92–3.35 (holotype: 3.20). Habitus as in Fig. 2 View FIGURES 1–4 .

Body dark reddish-brown; each elytron with very indistinct reddish-brown macula similar to those in O. amplimaculata sp.n., but with very distinct round yellowish spots in middle; ocelli, mouthparts, antennomeres 1–5 and legs reddish-yellow; antennomeres 6–11 brown. Punctation of head irregular, moderately small and deep, denser in middle portion, infraorbital ridges without punctures; punctation of pronotum as that on head, but denser and slightly smaller, sparser on anterior, basal and sometimes (holotype) on mediobasal portions; elytra with moderately sparse small punctation, denser and smaller along suture, coarser in basal portion near scutellum, sometimes somewhat larger and coarser on entire length in middle (one paratype); punctation of abdominal tergites very sparse, small and indistinct. Anterior and middle portion of head with transverse and infraorbital ridges with cellular distinct microsculpture; neck with dense and very distinct transverse, small microsculpture; middle portion of pronotum with microsculpture similar in that of middle portion of head, lateral portions of pronotum with irregular diagonal meshes; scutellum with narrow transverse meshes.

Head 1.5–1.6 times as broad as long, with slightly elevated middle portion, with very deep elongate grooves, clearly reaching level of posterior margin of eyes. Postocular ridges very obtuse. Distance between ocelli slightly shorter than distance between ocellus and posterior margin of eye. Palpomere IV of maxillary palps slightly more than twice as long as penultimate palpomere. Length × width of antennomeres (holotype): 1: 0.11 × 0.06; 2: 0.06 × 0.05; 3: 0.05 × 0.04; 4: 0.03 × 0.04; 5: 0.04 × 0.05; 6: 0.05 × 0.06; 7–9: 0.05 × 0.07; 10: 0.06 × 0.07; 11: 0.09 × 0.07.

Pronotum 1.3–1.4 times as broad as long, widest slightly above middle, gradually rounded anteriad and distinctly narrowing posteriad; surface of disc with two distinct, very wide longitudinal depressions widened basally and very deep and large lateral impressions, beginning from middle posteriad (one paratype with less pronounced lateral impressions).

Elytra about as long as wide or slightly longer, slightly less than twice as long as pronotum; one paratype with irregularly and slightly elevated surface between punctures in middle portion of each elytron.

Male. Protarsomeres 1–4 slightly widened. Apical margin of abdominal tergite VIII ( Fig. 7 View FIGURES 5–12 ) straight. Apical margin of abdominal sternite VIII ( Fig. 8 View FIGURES 5–12 ) slightly emarginated. Aedeagus ( Figs. 15–16 View FIGURES 13–17 ) with wide basal portion gradually narrowing toward rounded apex; parameres slightly exceeding apex of median lobe, with slightly widened apex bearing two apical and two preapical elongate setae and several very small setae along inner edge of basal portion of setiferous lobe; internal sac long, with paired field of elongate thorns in middle. Aedeagus with everted internal sac as in Fig. 15 View FIGURES 13–17 . Aedeagus laterally as in Fig. 17 View FIGURES 13–17 .

Female. Protarsomeres 1–4 moderately narrow. Apical margins of abdominal tergite VIII and sternite VIII slightly rounded.

Comparative notes. Based on the shape of the forebody, presence of maculae on the elytra and absence of medial teeth on the abdominal sternite VIII of male, O. bimaculata sp.n. is most similar to O. amplimaculata sp.n., from which it differs by less convex forebody, darker legs and antennomeres 1–5, by the presence of distinct yellowish round spots in the middle of reddish-brown maculae of each elytron, narrow antennomeres 6–10 and details of the morphology of wider aedeagus.

Distribution. The new species is at present known from several localitues ( Fig. 22 View FIGURE 22 ) in Xue Shan and Haba Shan ranges in Yunnan, China.

Bionomics. Specimens were collected at elevations from 3850 to 4075 m a.s.l., by sifting of forest litter (locality: sift23), in remnant of an original Abies , Betula , Rhododendron forest, sifing of leaf litter, moss and various debris under Rhododendrons at edges of a snow field (locality: C152) and in the same forest by sifting of moss and debris under it on old fallen trees (locality: C153a).

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