Pterostichus (Orientostichus) jialini, 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

Pterostichus (Orientostichus) jialini sp. nov.

Figs 6 , 12 , 18 , 38 Chinese vernacular name: 家麟通缘步甲

Type locality.

China, Sichuan province: Liangshan Yi Autonomous Prefecture, Huidong county, Jiamashi pasture (26.81N, 102.68E, alt 3000 m).

Type material.

Holotype: ♂: "China, Sichuan province, Liangshan autonomous prefecture, Huidong county, Jiamashi pasture, 3000 m, 2021.VII, pitfall trap", "HOLOTYPE ♂ Pterostichus (Orientostichus) jialini sp. nov. det. Yin & Shi, 2022" [red label]. Paratype: 1 ♂ (CYHL): the same data as holotype but labeled as paratype.

Diagnosis.

Elytra with several large foveate discal pores on intervals 3, 5, and 7, forming strong catenulate sculpturing. Antennomere 3 without accessory setae. Pronotum subcordate, strongly narrowed to base (PBW/PW = 0.65-0.67); posterior angles blunt and inconspicuously projected laterally; basal foveae depressed between inner and outer grooves which partly fused (Fig. 12 ). Sexual modification on sternite VII asymmetrical, with a large tubercle and two small protuberances on its right-basal side (Fig. 38 ). Apical lamella of male genitalia gradually narrowed to apex.

Comparison.

P. jialini sp. nov. is most similar to P. pulcher as both species differ from other five species of the P. pulcher species group in having large foveate discal pores on interval 7, forming catenulate sculpturing. Compared with P. pulcher , P. jialini sp. nov. is different in: (1) pronotum more strongly constricted to the base, with PBW/PW = 0.65-0.67 (vs PBW/PW = 0.75-0.81 in P. pulcher ); (2) pronotum posterior angles blunt and inconspicuously projected laterally, while P. pulcher has posterior angles acute at apex and distinctly projected laterally; (3) pronotal basal foveae depressed between inner and outer grooves, but convex in P. pulcher ; (4) male sternite VII with distinct and asymmetrical secondary sexual characters, while in P. pulcher male sternite VII shallowly and symmetrical tumid; (5) the apical lamella of male genitalia with its lateral margins convergent to apex, but in P. pulcher , the apical lamella with lateral margins subparallel to apex.

Description.

BL = 15.4-15.5 mm, BW = 5.7-5.8 mm, dorsal surface and appendages black, elytra with very faint metallic luster. Antennomere 3 without accessory setae, only with primary setae forming apical ring. Pronotum subcordate, PW/PL = 1.13-1.15, widest near middle; anterior margin slightly wider than posterior margin; strongly narrowed to base (PBW/PW = 0.65-0.67); lateral margins evenly arched from anterior angles to middle, distinctly sinuate before posterior angles; posterior angles rather blunt, apex rounded-obtuse, inconspicuously projected laterally; lateral margins with 2-4 mid-lateral setae near maximum width; basal foveae impunctate, depressed between inner and outer grooves, making them seems partly fused together (Fig. 12 ); disc with fine transverse wrinkles aside median line. Elytra oblong; parascutellar pore absent; intervals 3, 5, and 7 each with ≥ 3 large foveate discal pores, forming strong catenulate sculpturing. Male sternite VII with asymmetric modification, a large tubercle bending to right and two small protuberances on its right-basal side (Fig. 38 ). Median lobe of aedeagus stout, strongly curved near basal 1/3; apical lamella gradually deflected ventrally; apical lamella slightly twisted longitudinally, (LL/LW = 1.75-1.9), subtriangular with lateral margins convergent to apex, apex rounded (Fig. 18 ). Endophallus not studied due to restricted number of specimens.

Distribution.

This species is only known from its type locality in Huidong county, Liangshan Yi Autonomous Prefecture (Fig. 42 ).

Etymology.

The scientific name of the new species is dedicated to Mr. Jialin Tian, the collector of two type specimens.

Figures

Figure 42. Distribution of the taxa of Pterostichus pulcher species group in Sichuan province, China. Brown: P. pemphis sp. nov. Yellow: P. orbicollis sp. nov. Red: P. leo sp. nov. Purple: P. liyuani sp. nov. Blue: P. condylus sp. nov. Green: P. jialini sp. nov. Orange: P. pulcher Sciaky & Allegro.

Figures 1 - 6. Habitus and labels of Pterostichus pulcher species group 1 P. pemphis sp. nov., holotype 2 P. orbicollis sp. nov., holotype 3 P. leo sp. nov., holotype 4 P. liyuani sp. nov., holotype 5 P. condylus sp. nov., holotype 6 P. jialini sp. nov., holotype. Scale bar: 5 mm.

Figures 7 - 12. Pronota of Pterostichus pulcher species group 7 P. pemphis sp. nov., holotype 8 P. orbicollis sp. nov., holotype 9 P. leo sp. nov., holotype 10 P. liyuani sp. nov., holotype 11 P. condylus sp. nov., holotype 12 P. jialini sp. nov., holotype. Scale bars: 1 mm.

Figures 13 - 18. Male genitalia of Pterostichus pulcher species group, left lateral view and dorsal view of median lobe of aedeagus 13 P. pemphis sp. nov., holotype 14 P. orbicollis sp. nov., holotype 15 P. leo sp. nov., holotype 16 P. liyuani sp. nov., holotype 17 P. condylus sp. nov., holotype 18 P. jialini sp. nov., holotype. Scale bar: 1 mm.

Figures 34 - 39. Male sternum VII of Pterostichus pulcher species group spp. 34 P. pemphis sp. nov., holotype 35 P. orbicollis sp. nov., holotype 36 P. liyuani sp. nov., holotype 37 P. condylus sp. nov., holotype 38 P. jialini sp. nov., holotype 39 P. pulcher Sciaky & Allegro, holotype. Scale bar: 1 mm.