Pterostichus (Orientostichus) pemphis, 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/69D91D53-ECC3-4E35-B0FE-7CE16F72A5B6
taxon LSID	lsid:zoobank.org:act:69D91D53-ECC3-4E35-B0FE-7CE16F72A5B6
treatment provided by	ZooKeys by Pensoft
scientific name	Pterostichus (Orientostichus) pemphis
status	sp. nov.

Treatment

Pterostichus (Orientostichus) pemphis sp. nov.

Figs 1 View Figures 1–6 , 7 View Figures 7–12 , 13 View Figures 13–18 , 19 View Figures 19–24 , 34 View Figures 34–39 , 40 View Figures 40, 41 , 41 Chinese vernacular name: 泡通缘步甲 View Figures 40, 41

Type locality.

China, Sichuan province: Liangshan Yi Autonomous Prefecture, Puge county, Shuihaizi wind power station (27.33N, 102.45E, alt 3515 m).

Type material.

Holotype: ♂: "China: Sichuan prov., Puge County, Shuihaizi wind power station, meadow + rhodo. + fir. 3515 m, N27.3355, E102.4461", "2018.VII.21, pitfall trap. Shi HL, Yan WF, Zhu PZ & Jiang ZY lgt., IZAS & BJFU exp. 2018", "HOLOTYPE ♂ Pterostichus (Orientostichus) pemphis sp. nov. det. Yin & Shi, 2022" [red label]; Paratypes (a total of 96 ♂ and 79 ♀): 19 ♂ and 24 ♀: the same data as holotype but labeled as paratype; 1 ♂ 2 ♀: "China: Sichuan prov., Butuo county, Juesa vill., Pukui mt., alpine meadow, 3248 m, N27.4233, E102.7604", "2015.VII.26, pitfall trap, Shi HL, Liu B & Ma YL lgt., BJFU exp. 2015", "PARATYPE of Pterostichus (Orientostichus) pemphis sp. nov. det. Yin & Shi, 2022" [red label]; 76 ♂ and 53 ♀ (CHYL): "China, Sichuan province, Liangshan autonomous prefecture, Zhaojue county, Jiefanggou town, 3000 m, 2022.VI, leg by Li Yuan", "PARATYPE of Pterostichus (Orientostichus) pemphis sp. nov. det. Yin & Shi, 2022" [red label].

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, evenly curved before posterior angles; posterior angles rounded, apex with an additional blunt denticle which distinctly prominent (Fig. 7 View Figures 7–12 ); lateral margins with 2-4 mid-lateral setae. Male sternite VII with a well-defined smooth tubercle (Fig. 34 View Figures 34–39 ). Apical lamella of aedeagus wide and short (LL/LW = 1.35-1.55), apex rounded (Fig. 13 View Figures 13–18 ); endophallus with right branch of bsp tuberculate on dorsal surface (Fig. 19 View Figures 19–24 ).

Comparison.

From the external features, P. pemphis sp. nov. is most similar to the following two new species, P. leo sp. nov. and P. orbicollis sp. nov. as all these three have accessory setae on antennomere 3, nearly circular pronotum, and dorsally tuberculate bsp on endophallus.

The present new species is different from P. leo sp. nov. by: (1) pronotum disc with distinct transverse wrinkles, but at most with very faint wrinkles in the latter species; (2) pronotal lateral margins evenly arched before posterior angles, posterior angles with a distinctly prominent denticle (Fig. 7 View Figures 7–12 ), but in the latter species, pronotal lateral margins slightly sinuate before posterior angles, posterior angles with a smaller denticle (Fig. 9 View Figures 7–12 ); (3) lateral margins with ≥ 2 mid-lateral setae, but with only one mid-lateral seta in the latter species; (4) male sternite VII with a smooth tubercle, but not modified in the latter species; (5) apical lamella of male genitalia short and straight, but strongly elongate and turned upward in the latter species.

Compared to P. orbicollis sp. nov., P. pemphis sp. nov. is different in: (1) posterior angles with a distinctly prominent denticle (Fig. 7 View Figures 7–12 ), but not dentate in P. orbicollis (Fig. 8 View Figures 7–12 ); (2) lateral margins with ≥ 2 mid-lateral setae, but with only one such seta in the latter species; (3) apical lamella of aedeagus a little longer than in P. orbicollis (LL/LW = 1.35-1.55 vs 1.1-1.25).

The present new species cohabitates with P. liyuani sp. nov. in Shuihaizi of Puge county. These two species can be easily distinguished by the differences on the shape of pronotum, the chaetotaxy on antennomere 3, and the sexual modification on male sternite VII ( P. pemphis sp. nov. with a larger tubercle).

Description.

BL = 14.5-18.2 mm, BW = 5.0-6.0 mm, dorsal surface and appendages black, elytra often a little reddish brown. Antennomere 3 with accessory setae on apical 2/3 in addition to the primary setae forming apical ring. Pronotum nearly circular, PW/PL = 1.20-1.24, widest near anterior 1/3; anterior margin wider than posterior margin; strongly narrowed to base (PBW/PW = 0.61-0.65); lateral margins evenly arched from anterior angles to posterior angles, not sinuate before posterior angles; posterior angles rounded, apex with an additional blunt denticle which distinctly prominent; lateral margins with 2-4 mid-lateral setae 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 depressed (Fig. 7 View Figures 7–12 ); disc with fine transverse wrinkles aside median line. Elytra oblong; parascutellar pore usually absent, but present in some specimens from Zhaojue county; intervals 3 and 5 each with ≥ 3 large foveate discal pores; interval 7 without discal pore. Male sternite VII with well-defined smooth tubercle on middle (Fig. 34 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 = 1.35-1.55), apex rounded (Fig. 13 View Figures 13–18 ). Endophallus long, straightly directed ventrally, gonopore opened to ventral-basal direction of aedeagus; vb distinct, oblate, rounded at both apexes; bsp deeply grooved, nearly U-shaped, dorsal surface of right branch folded and strongly hooked forming a tubercle (Fig. 19 View Figures 19–24 ).

Distribution.

This species is relatively widely distributed from Puge county to Zhaojue county, in Liangshan Yi autonomous prefecture (Fig. 42 View Figure 42 ).

Etymology.

The scientific name of the new species is derived from the Greek root pemph -, meaning blister, referring to the bump-shaped elytral intervals 3 and 5 of the new species.