Pterostichus (Wraseiellus) leishanensis Chen & Yin & Shi 2024, sp. nov.
Creators: name: Chen, Jia-Heng
name: Yin, Wen-Qi
name: Shi, Hong-Liang
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Pterostichus
Pterostichus leishanensis

description: Pterostichus (Wraseiellus) leishanensis sp. nov.
Chinese vernacular name: DZƜaeữfflm
Figures 2–3, 9B, 10B, 13C
Type materials. Holotype (IZAS): male, body length = 13.8 mm, “ China, Guizhou, Leishan, Leigongshan, old path N26.388424 E108.202103 ”// “ 2110m, 2017.V.12-14, Liu Y.Z. & Yu S.P. lgt., Institute of Zoology, CAS.”// “HOLOTYPE Pterostichus (Wraseiellus) leishanensis sp. nov., det. Chen & Shi. 2024” [red label]; Paratypes (a total of 3 males and 2 females): 1 male and 1 female (IZAS), the same data as holotype; 2 males and 1 female (IZAS), “ China, Guizhou, Leishan, Leigongshan, hilltop, N26.3863 E108.203155 ”// “ 2103m, 2017.V.12-14, Liu Y.Z. & Yu S.P. lgt., Institute of Zoology, CAS.”.
Diagnosis. Frontal furrows deep and long, V-shaped furcating backward, reaching level of posterior margin of eyes; vertex finely and densely punctate; temporae well-developed (TL/EYL = 0.60–0.62). Maximum width of pronotum near middle; lateral margins almost straight before posterior angles; posterior angles distinct, slightly acute or rectangular, forming a prominent denticle; pronotal base sparsely and coarsely punctate; ridge between outer groove and lateral margin distinct. Elytra relatively short and ovate, lateral margins distinctly arched near middle; humeral teeth small but distinct. Median lobe of aedeagus stout, apical portion slightly ventrally curved, apical lamella not turned dorsally; in dorsal view (Fig. 3B), apical lamella short, rounded-triangular, slightly twisted to right; ventral surface of apical lamella with sharp ridge; right paramere laminar, slightly curved, apex sharply pointed (Fig. 3C).
Comparisons. The new species is most similar to P. meyeri, for both have the following character combinations distinguishing them from other species of this group: (1) pronotum nearly circular, posterior margin wider than anterior margin; (2) area between inner and outer basal foveal grooves more or less convex; (3) median lobe of aedeagus with apical lamella short, apex rounded and not bent to the left in dorsal view, evenly thickened without capitate apex in lateral view; (4) right paramere short and laminar, slightly curved. Comparing to P. meyeri, the new species is different in: (1) pronotum with mid-basal area between two basal foveae sparsely punctate (versus very densely punctate in P. meyeri), the punctate area smaller, covering less than posterior fifth length of pronotum (versus covering posterior fourth in P. meyeri); (2) area between inner and outer basal foveal grooves less convex (versus very strongly convex, forming a distinct ridge in P. meyeri); (3) elytra short-ovate shaped, lateral margins distinctly arched near middle (versus much more oblong, lateral margins subparallel in P. meyeri); (4) apical lamella of aedeagus more distinctly twisted to right and apically narrowed than P. meyeri in dorsal view; (5) right paramere apically sharply pointed (versus feebly angulate in P. meyeri).
Description. BL 13.8–15.0 mm; dorsal surface black or dark reddish brown, without metallic luster (Fig. 2).
Head. Frons finely and sparsely punctate, relatively densely in frontal furrows; frontal furrows well-developed, extending and V-shaped furcating backward, reaching level of posterior margin of eyes; vertex finely and densely punctate; temporae well-developed (TL/EYL = 0.60–0.62), distinctly swollen behind eyes; paraocular grooves deep, impunctate and nearly straight, reaching posterior margin of eyes; antennomere 3 without accessory setae. Pronotum nearly circular (PW/PL 1.36–1.39); anterior and posterior margins almost straight, lateral margins evenly curved, hardly sinuate before posterior angles; posterior margin wider than anterior margin; anterior angles obtusely rounded, not projecting; posterior angles distinct, slightly acute or nearly rectangular, apex distinctly prominent forming a denticle; discal area glabrous, with weak transverse wrinkles; basal fovea relatively wide, deep and areal punctate, area between inner and outer basal foveal grooves rugose, shallowly convex; mid-basal area between basal foveae sparsely punctate, with dense and coarse reticular wrinkles; ridge between outer groove and lateral margin distinct; some very fine and sparse punctures also present in lateral channel; one mid-lateral and one basal-lateral seta present on each side. Elytra short and ovate (EL/EW 1.34–1.37), lateral margins distinctly arched near middle, and then strongly narrowed to apex; humeral teeth small but distinct; intervals convex; striae moderately deep, without punctures; parascutellar stria short, apex free or joined to stria 1; umbilicate series on interval 9 composed of approximately 14–19 pores, sparse in middle and dense in anterior and posterior areas; males with faint isodiametric microsculpture, females with granular microsculpture. Ventral side. Proepisterna and metaepisterna finely punctate, posterior half of proepisterna with punctures sparser; sternite VII of males with a lunate transverse ridge near middle, faintly defined, median region of sternite VII shallowly depressed posterior to the ridge. Legs. Tarsomere 5 with two to four pairs of setae beneath. Male genitalia (Figs 3, 10B). Median lobe of aedeagus relatively stout, tapered to apex; in lateral view, ventral margin almost straight near middle, apex slightly bent ventrally, apical orifice large, slightly turned to left, apical lamella evenly thickened, apex not capitate or turned dorsally; in dorsal view, apical lamella short (AL/AW 0.91–1.03), apex rounded-triangular, slightly twisted to right; ventral surface of apical lamella with a sharp ridge, slightly concaved on its left side (Fig. 10B). Right paramere short and laminar, slightly curved, apex sharply pointed. Endophallus (Fig. 3D, E) bent to ventral side across left side of aedeagus, major parts of endophallus located on ventral side of aedeagus (in lateral view); gonopore (gp) opened to ventral-basal direction of aedeagus; ventral-right lobe (vr) large and round, with coarse setae on its dorsal-apical surface; pre-apical lobe (pa) ellipsoidal, visible in both lateral views. Female genitalia (Fig. 13C). Gonocoxite 2 with two or three ensiform setae at base of outer margin, and three or four at inner margin. Internal reproductive tracts not studied due to limited specimens.
Etymology. This new species is named for its type locality, Leishan county.
Distribution. Only known from the high elevation of Leigongshan Mountain, Leishan County in Guizhou Province.
Habitat. All specimens of the type series were collected near the peak of Mt. Leigongshan by pitfall traps in alpine shrubs, with dominance of Fargesia spp. and Rhododendron spp.
description: Published as part of Chen, Jia-Heng, Yin, Wen-Qi & Shi, Hong-Liang, 2024, On the Pterostichus subgenus Wraseiellus from China: descriptions of five new species and supplementary notes on taxonomy (Coleoptera: Carabidae), pp. 451-472 in Zootaxa 5447 (4) on pages 456-459, DOI: 10.11646/zootaxa.5447.4.1, http://zenodo.org/record/11150249