Omaliopsis, Jeannel, 1940

Shavrin, Alexey V., 2023, Four new species of the genus Omaliopsis Jeannel, 1940 (Coleoptera: Staphylinidae: Omaliinae: Omaliini) of China, Zootaxa 5380 (5), pp. 446-460 : 459

Key to Asian species of Omaliopsis (modified from Shavrin 2019)

1 Each elytron with distinct pale macula.................................................................... 2

- Elytra without maculae, unicoloured...................................................................... 9

2 Temples with distinct postocular ridges................................................................... 3

- Temples without postocular ridges....................................................................... 4

3 Elytra shorter, distinctly less than twice as long as pronotum. Antennomeres 6–10 transverse. Punctation of pronotum very dense and deep. Apical portion of median lobe moderately narrow; parameres distinctly longer than apex of median lobe ( Fig. 2 in Shavrin (2020)). Body brown, with yellow-brown elytra with darkened median portion. Body length: 3.40 mm. Habitus as in Fig. 1 in Shavrin (2020). China: Sichuan .......................................... O. feldmanni Shavrin, 2020

- Elytra longer, about twice as long as pronotum. Antennomeres 6–10 slightly elongate. Punctation of pronotum sparse and fine. Apical portion of median lobe relatively wide; parameres shorter, reaching apex of median lobe ( Shavrin 2019: Fig. 13 ). Body reddish-brown, with wide and elongate yellow-brown maculae in middle. Body length: 3.14 mm. Habitus as in Fig. 1 in Shavrin (2019). China: Sichuan ............................................... O. amplimaculata Shavrin, 2019

4 Elytra distinctly less than twice as long as pronotum. Median lobe very wide, with bilobed apex ( Fig. 4 in Shavrin (2023)). Female accessory sclerite as in Fig. 8 ( Shavrin 2023). Body length: 3.05–3.50 mm. Habitus as in Fig. 1 in Shavrin (2023). Taiwan....................................................................... O. propinqua Shavrin, 2023

- Elytra as long as or distinctly more than twice as long as pronotum. Median lobe narrow, with rounded apex............ 5

5 Temples moderately long, convex. Each elytron with small round yellowish spot in middle. Median lobe and parameres moderately wide; inner apical edges of parameres with several elongate setae ( Shavrin 2019: Figs. 15–16 ). Body length: 2.92–3.35. Habitus as in Fig. 2 in Shavrin (2019). China: Yunnan ........................ O. bimaculata Shavrin, 2019

- Temples very short, strongly narrowed toward neck. Coloration of elytra different. Median lobe and parameres distinctly narrower; inner edges of parameres without setation......................................................... 6

6 Elytra longer, distinctly more than twice as long as pronotum................................................. 7

- Elytra slightly shorter, about twice as long as pronotum...................................................... 8

7 Punctation of head and pronotum fine and sparse. Elytra distinctly darker, reddish-brown, with yellowish lateroapical and apical portions of elytra. Parameres slightly shorter, with narrower apical portions; internal sac with narrow, long and curved sclerites ( Figs. 5, 7–8, 10 ). Female accessory sclerite as in Fig. 15 . Body length: 2.17–2.95 mm. Habitus as in Fig. 1 . China: Sichuna, Yunnan ....................................................................... O. fraterna sp. n.

- Punctation of head and pronotum moderately large and dense. Elytra paler, yellowish brown, usually with moderately large darkened spot on medioapical part of each elytron. Parameres slightly longer, with broader apical portions; internal sac with two wide transverse and very long sclerites ( Fig. 32 ). Female accessory sclerite as in Fig. 38 . Body length: 2.45–3.42 mm. Habitus as in Fig. 4 . China: Sichuan, Shaanxi, Yunnan ........................................ O. smetanai sp. n.

8 Punctation of pronotum dense. Elytra about as long as broad. Forebody reddish-brown to dark brown, with yellowish lateroapical and lateral portions of elytra. Parameres longer, slightly not exceeding apex of median lobe; internal sac with long and wide two pairs of elongate sclerites ( Fig. 18 ). Female accessory sclerite as in Fig. 24 . Body length: 1.95–2.75 mm. Habitus as in Fig. 2 . China: Sichuan .................................................................. O. hlavaci sp. n.

- Punctation of pronotum distinctly sparse. Elytra slightly broader than long. Forebody yellow-brown to reddish brown, with paler elytra and elongate oblique spot in apical half of each elytron. Parameres significantly shorter than apex of median lobe; internal sac with paired elongate and wide sclerites ( Fig. 25 ). Female abdominal segment as in Fig. 31 . Body length: 1.92–2.37 mm. Habitus as in Fig. 3 . China: Shaanxi ............................................... O. obliquesignata sp. n.

9 Head with markedly large eyes and indistinct temples. Apical part of aedeagus bilobed ( Shavrin 2019: Fig. 18 ). Body length: 3.30–3.60 mm. Habitus as in Fig. 3 in Shavrin (2019). China: Jiangxi, Hong Kong....... O. musaphila (Rougemont, 2017)

- Head with moderately small eyes and distinct short temples.................................................. 10

10 Pronotum widest about middle. Aedeagus as in Fig. 20 ( Shavrin 2019). Body smaller: 3.15–3.54. Habitus as in Fig. 4 in Shavrin (2019). Nepal.................................................................... O. schmidti Shavrin, 2019

- Pronotum widest in anterior third. Body larger: 3.50–4.30 mm. Northern India........... O. himalayica ( Cameron, 1924)

Figures

FIGURES 1–4. Habitus of Omaliopsis: 1—O. fraterna (holotype), 2—O. hlavaci (holotype), 3—O. obliquesignata (holotype), 4—O. smetanai (holotype). Scale bars: 1.0 mm.

FIGURES 11–16. Omaliopsis fraterna: 11–male tergite VIII, 12–male sternite VIII, 13–female tergite VIII, 14–female sternite 8, 15–female accessory sclerite, 16–spermatheca. Scale bar: 0.1 mm.

FIGURES 5–10. Aedeagus of Omaliopsis fraterna (Figs 5–8: Gaoligong Shan; Fig. 9: Heishui, Fig. 10: Zhongdian): 5, 7–8, 10—parameral view, 6, 9—lateral view. Scale bar: 0.1 mm.

FIGURES 32–39. Omaliopsis smetanai: 32–aedeagus, parameral view, 33–aedeagus, lateral view, 34–male tergite VIII, 35– male sternite VIII, 36–female tergite VIII, 37–female sternite 8, 38–female accessory sclerite, 39–spermatheca. Scale bar: 0.1 mm.

FIGURES 18–24. Omaliopsis hlavaci: 18–aedeagus, parameral view, 19–aedeagus, lateral view, 20–male tergite VIII, 21–male sternite VIII, 22–female tergite VIII, 23–female sternite 8, 24–female accessory sclerite. Scale bar: 0.1 mm.

FIGURES 25–31. Omaliopsis obliquesignata: 25–aedeagus, parameral view, 26–aedeagus, lateral view, 27–male tergite VIII, 28–male sternite VIII, 29–female tergite VIII, 30–female sternite 8, 31–female accessory sclerite. Scale bar: 0.1 mm.