Pterostichus (Wraseiellus) idiopterus, Chen & Yin & Shi, 2024

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), Zootaxa 5447 (4), pp. 451-472 : 461-463

Pterostichus (Wraseiellus) idiopterus sp. nov.

Chinese vernacular name: Ƃaeaeữfflm

Figures 5–6 , 9D , 13A, 13D

Type materials. Holotype: male, body length = 13.0 mm, ( IZAS), “ CHINA: Yunnan, Diqing, Weixi County, Zhonglu Township , 2771m, N27.2404236 E99.0199035 2022.V-14 ” // “HOLOTYPE Pterostichus (Wraseiellus) idiopterus sp. nov., det. Chen & Shi. 2024” [red label] ; Paratypes (a total of 87 males and 57 females): 12 males and 10 females ( CCJH), the same data as holotype ; 72 males and 45 females ( IZAS, CBFU), “ Yunnan, Weixi county, Zhonglu, Zanli village , 2022.VI.8, Yu Zhibiao lgt.” ; 1 male ( CLHY), “ Yunnan Province, Diqing, Weixi, Zhonglu , Dayingpan , 3000m, 2022.V, Feng Xiangzhong lgt.” ; 2 males and 2 females ( CLYH), “ Yunnan, Weixi, Zhonglu , Zanli, 2022.VI.20, Yu Zhibiao lgt.” .

Diagnosis. Frontal furrows shallow and short, exceeding level of anterior margin of eyes; vertex nearly impunctate; temporae short (TL/EYL 0.31–0.33). Maximum width of pronotum near middle; lateral margins nearly straight before posterior angles; posterior angles obtuse, without denticle; basal foveal area sparsely punctate, outer groove short but well-defined. Elytral intervals heterogeneous, on elytra median region, odd intervals about twice width as even ones. Apical lamella of aedeagus laminar, apex not thickened or turned dorsally ( Fig. 6A ); right paramere short and laminar, apex rounded ( Fig. 6C ).

Comparisons. This new species can be easily distinguished from all other species of the subgenus by its heterogeneous elytral intervals. Besides the elytral characters, P. idiopterus sp. n. is also different from other species of the diversus species-group by the combination of: (1) pronotum with posterior margin narrower than anterior margin; (2) pronotal posterior angles obtuse; (3) females with slightly stronger isodiametric elytral microsculpture than males, but not granular; (4) in dorsal view, apical lamella of aedeagus indistinctly bent to left; (5) right paramere short, apex widely rounded.

Despite their conspicuous differences on elytra, the new species is inferred to be closest to P. pseudodiversus for their similarities on male genitalia: apical lamella short and slightly twisted, apex not turned dorsally. Comparing to the latter species, the male genitalia of P. idiopterus sp. n. is different in the apical lamella only very weakly turned to left and right paramere much shorter.

Description. BL 12.7–14.2 mm; dorsal surface dark brown to black, without metallic luster, elytral lateral margin and epipleura reddish brown ( Fig. 5 ). Head. Frons finely and sparsely punctate, frontal furrows short and shallow, exceeding level of eyes’ anterior margin; vertex impunctate or with very few fine punctures; temporae short (TL/EYL 0.31–0.33), not swollen behind eyes; paraocular grooves deep, impunctate and nearly straight, reaching posterior margin of eyes; antennomere 3 without accessory setae. Pronotum sub-cordiform (PW/ PL 1.31–1.35); anterior and posterior margins almost straight, lateral margins evenly curved from anterior angles to posterior third, nearly straight or weakly sinuate before posterior angles; anterior margin slightly wider than posterior margin; anterior angles obtusely rounded, slightly projecting forwardly; posterior angles obtuse, apex a little distinct, not forming prominent denticle; discal area glabrous with faint transverse wrinkles; basal foveae relatively short and wide, deeply depressed and areal punctate, outer groove short but well-defined, area between inner and outer basal foveal grooves rugose and depressed, mid-basal area between two basal foveae sparsely and finely punctate, ridge between outer groove and lateral margin distinct; one mid-lateral seta and one basal-lateral seta present on each side. Elytra oblong (EL/EW 1.48–1.52); humeral teeth small; intervals heterogeneous and slightly convex, odd intervals (1, 3, 5 and 7) obviously wider than even ones, about twice width as even ones on elytra middle, slightly convex similarly to even ones; striae relatively shallow, without punctures; parascutellar striae short, apex joined to stria 1, stria 1 usually entire at base; umbilicate series on interval 9 composed of approximately 13–16 pores, sparse in middle and dense in anterior and posterior areas; elytral microsculpture shallowly isodiametric in males, stronger in females but not granular as other species of the subgenus. Ventral side. Proepisterna rugose, usually with coarse and dense punctures on anterior half; metaepisterna coarsely punctate; sternite VII of males without sexual structure.

Legs. Tarsomere 5 without setae beneath. Male genitalia ( Fig. 6 ). Median lobe of aedeagus relatively slender; in lateral view, ventral margin almost straight near middle, weakly curved to the ventral side at apical third, apical orifice large, slightly turned to left side, apical lamella evenly thin, not apically thickened or dorsally turned; in dorsal view, apical lamella short (AL/AW 1.09–1.19), gradually narrowed to apex, apex rounded-truncated, very weakly bent to left; ventral surface of apical lamella simple. Right paramere laminar, apical portion (area distal to the articulation) very short, apex rounded. Endophallus ( Figs 6D, 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; surface with fine scales, denser near gonopore, without coarse setae; pre-apical lobe (pa) rounded, visible in both lateral views. Female genitalia ( Figs 13A, D ). Spermatheca with the seminal canal about five times long as receptaculum; seminal canal inserted at base of common oviduct; base of seminal canal sclerotized. Gonocoxite 2 with two or three ensiform setae at the outer margin and three or four at inner margin.

Etymology. The scientific name of the new species is the combination of the Greek root “ idio -”, which means pertaining to self, personal, and the Greek root “ Pter- ”, referring to its heterogeneous elytral intervals.

Distribution. Only known from the mountain area western to Zhonglu, Weixi Lisu Autonomous County in Northwest Yunnan. This new species was collected at the Biluoxueshan mountain range, western to Lancang Jiang (= Mekong River); while the more widely distributed species P. pseudodiverus Shi & Sciaky is only distributed in area eastern to Lancang Jiang.

Figures

FIGURE 5. Habitus of Pterostichus idiopterus sp. nov. (A) holotype; (B) Paratype, female. Scale bar = 5.0 mm.

FIGURE 6. Male genitalia of Pterostichus idiopterus sp. nov., holotype. (A) median lobe of aedeagus, left lateral view; (B) median lobe of aedeagus, dorsal view; (C) right paramere; (D) endophallus, right lateral view; (E) endophallus, left lateral view. Scale bars = 1.0 mm. Abbreviations: pa pre-apical lobe; gp gonopore.

FIGURE 9. Pronotum posterior angle and basal area of Pterostichus (Wraseiellus) spp. (A) P. pseudandrewesi sp. nov.; (B) P. leishanensis sp. nov.; (C) P. strumatus sp. nov.; (D) P. idiopterus sp. nov.; (E) P. hemichlorus sp. nov..

FIGURE 13. Female genitalia of Pterostichus (Wraseiellus) spp. (A–B) female internal reproductive tracts; (C–E) gonocoxites of ovipositor, ventral view (left) and dorsal view (right, gonocoxite 2 only). (A, D) P. idiopterus sp. nov.; (B, E.) P. hemichlorus sp. nov.; (C) P. leishanensis sp. nov. Scale bars = 1.0 mm for A–B; = 0.5 mm for C–E. Abbreviations: bc bursa copulatrix; co common oviduct; sc seminal canal; rc receptaculum; g1 gonocoxite 1; g2 gonocoxite 2; es ensiform setae; ns nematiform setae.