Pterostichus (Orientostichus) orbicollis, Yin & Zhu & Shi, 2023

Yin, Wenqi, Zhu, Pingzhou & Shi, Hongliang, 2023, Taxonomic study on the subgenus Orientostichus, the Pterostichus pulcher species group (Coleoptera, Carabidae, Pterostichus), ZooKeys 1175, pp. 163-185 : 163

publication ID	https://dx.doi.org/10.3897/zookeys.1175.107636
publication LSID	lsid:zoobank.org:pub:E88FF072-E8C9-45AE-A494-4B2A5F7DD7E8
persistent identifier	https://treatment.plazi.org/id/90A3FB24-DEF5-4244-A000-004B432F6D12
taxon LSID	lsid:zoobank.org:act:90A3FB24-DEF5-4244-A000-004B432F6D12
treatment provided by	ZooKeys by Pensoft
scientific name	Pterostichus (Orientostichus) orbicollis
status	sp. nov.

Treatment

Pterostichus (Orientostichus) orbicollis sp. nov.

Figs 2 View Figures 1–6 , 8 View Figures 7–12 , 14 View Figures 13–18 , 20 View Figures 19–24 , 25 View Figures 25–30 , 35 Chinese vernacular name: 圜胸通缘步甲 View Figures 34–39

Type locality.

China, Sichuan province: Liangshan Yi Autonomous Prefecture, Huili county, Longzhoushan mountain (26.79N, 102.20 E, alt 3500 m).

Type material.

Holotype: ♂: "China: Sichuan, Huili county, Longzhoushan mt., way to the peak, Rhododendron shrubs + meadow, by pitfall trap", "3500 m, N26.7921, E102.2035, 2015.VII.19, Shi HL, Liu B & Ma YL lgt., BJFU exp. 2015", "HOLOTYPE ♂ Pterostichus (Orientostichus) orbicollis sp. nov. det. Yin & Shi, 2022" [red label]; Paratypes: 6 ♂ and 16 ♀: the same data as holotype but labeled as paratypes.

Diagnosis.

Elytral intervals 3 and 5 each with ≥ 3 large foveate discal pores, interval 7 without discal pore. Antennomere 3 with accessory setae. Pronotum nearly circular; posterior angles completely rounded without denticle (Fig. 8 View Figures 7–12 ); lateral margins with one mid-lateral seta. Male sternite VII with a well-defined smooth tubercle (Fig. 35 View Figures 34–39 ). Apical lamella of aedeagus short and wide (LL/LW = 1.1-1.25), apex rounded (Fig. 14 View Figures 13–18 ); endophallus with right branch of bsp tuberculate on dorsal surface (Figs 20 View Figures 19–24 , 25 View Figures 25–30 ).

Comparison.

From the presence of accessory setae on antennomere 3 and relatively short apical lamella of male genitalia, P. orbicollis sp. nov. is most similar to P. pemphis sp. nov. But these two species can be easily distinguished by the differences on the number of pronotal mid-lateral setae and shape of pronotal posterior angles (details see Comparison under the latter species).

Description.

BL = 14.7-15.8 mm, BW = 5.5-6.0 mm, dorsal surface and appendages black, elytra sometimes a little reddish brown. Antennomere 3 with accessory setae on apical 2/3 in additional to the primary setae forming apical ring. Pronotum nearly circular, PW/PL = 1.30-1.34, widest near anterior 1/3; anterior margin wider than posterior margin; strongly narrowed to base (PBW/PW = 0.66-0.69); lateral margins evenly arched from anterior angles to posterior angles; posterior angles completely rounded, without a trace of denticle (Fig. 8 View Figures 7–12 ); lateral margins with only one mid-lateral seta near maximum width; basal foveae impunctate, inner and outer grooves straight, partly fused at base, outer groove a little shorter than inner one, area between them slightly depressed; disc with fine transverse wrinkles aside median line. Elytra oblong, parascutellar pore absent; intervals 3 and 5 each with ≥ 3 large foveate discal pores; interval 7 without discal pore. Male sternite VII with well-defined tubercle on middle, small and smooth (Fig. 35 View Figures 34–39 ). Median lobe of aedeagus stout, strongly curved near basal 1/3; apical lamella gradually narrowed and deflected ventrally; apical lamella slightly twisted longitudinally, relatively short (LL/LW = 1.1-1.25), with rounded apex (Fig. 14 View Figures 13–18 ). Endophallus long, straightly directed ventrally, gonopore opened to ventral-basal direction of aedeagus; vb distinct, spherical, rounded at both apexes; bsp deeply grooved, nearly U-shaped, dorsal surface of right branch folded and strongly hooked forming a tubercle (Figs 20 View Figures 19–24 , 25 View Figures 25–30 ).

Distribution.

This species was only found in the type locality, Longzhoushan mountain, Huili county, Liangshan Yi Autonomous Prefecture (Fig. 42 View Figure 42 ).

Etymology.

The scientific name of the new species is composed of two Latin roots, orbi - meaning circular, and - collis meaning pronotum, referring to its completely rounded pronotum.