Pterostichus (Circinatus) agilis Allegro & Sciaky, 2010

Shi, Hongliang & Liang, Hongbin, 2015, The genus Pterostichus in China II: the subgenus Circinatus Sciaky, a species revision and phylogeny (Carabidae, Pterostichini), ZooKeys 536, pp. 1-92 : 29

Taxon classification Animalia Coleoptera Carabidae

Pterostichus (Circinatus) agilis Allegro & Sciaky, 2010 Figures 7, 37, 59, 74, 93, 116

Pterostichus (Circinatus) agilis Allegro and Sciaky 2010: 11 (Original: Pterostichus ( Circinatus ); holotype deposited in CRS).

Type locality.

Sichuan: Xichang, Luojishan, altitude 2200-2800 m.

Type material examined.

Holotype of Pterostichus agilis Allegro & Sciaky (CRS): teneral male, body length = 11.8 mm, board mounted, genitalia dissected and mounted by eupral on plastic film, pinned under specimen, "CHINA S Sichuan / Luojishan 2200-2800 / m 16-25.vii.1996 / leg. S.Kasantsev"; " HOLOTYPUS ♂ / Pterostichus / (Circinatus)/ agilis sp. n. / Allegro & Sciaky det. 2010" [red label].

Non-type material examined

(total 44 specimens). 3 males (IZAS), "China, Sichuan, Puge county, Luojishan, along tourist path, meadow or mixed forest; 2012.VI.8 D, N27.58423, E102.40257 - N27.58253, E102.39497, 2549-2805 m, YANG Xiaodong leg."; 1 female, "China, Sichuan, Puge county, Luojishan, tourist path, mixed forest, N27.58253, E102.39497, 2805 m, 2012.VI.10, under stone, YANG Xiaodong lgt."; 2 males, 3 females (IZAS), "China, Sichuan, Puge county, Luojishan, near No.1 glacial groove, mixed forest, 2012.VI.10 D, N27.58445, E102.37913, 3470 m, SHI Hongliang & LIU Ye leg."; 1 male, 3 female (IZAS), " China, Sichuan, Puge county, Luojishan, near No.1 glacial groove, mixed forest, / b27.58445, E102.37913, 2012.VI.10, pit fall trap, 3470 m, HUANG Hao leg."; 7 males 5 females (IZAS), "China, Sichuan, Puge county, Luojishan, upper ropeway station, mixed forest; 2012.VI.9 D, N27.58108, E102.38012, 3595 m, YANG Xiaodong leg."; 3 males, 5 females (IZAS), "China, Sichuan, Puge county, Luojishan, near ropway upper station, N27.58108, E102.38012, 3595 m, 2012.VI.10, pitfall trap, under rhododendra forest, SHI Hongliang & LIU Ye leg."; 1 male, 4 females (IZAS), "China, Sichuan, Puge county, Luojishan, Heilongtan lake, mixed forest; N27.57913, E102.37397, 3678 m, 2012.VI.9 N, LIU Ye & SHI Hongliang leg."; 3 males 1 female (IZAS), "China, Sichuan, Puge county, Luojishan, Xiancao lake, mixed forest, N27.57490, E102.36378; 2012.VI.9 D 3848 m, LIU Ye & SHI Hongliang leg."; 2 females (IZAS), "China, Sichuan, Puge county, Luojishan, Xianya lake, mixed forest; N27.57263 E102.36597, 2012.VI.10 pitfall trap, 3859 m, LIU Ye & SHI Hongliang leg.".

Diagnosis.

Pronotum with three to five mid-lateral setae; hind angle completely rounded; outer basal foveal groove vanished, outer area of inner groove completely flat; elytron with distinct isodiametric microsculpture; elytral humeral tooth distinct, short and sharp, pointed backwards; fifth tarsomeres glabrous beneath; males with terminal sternum unmodified, penultimate sternum slightly tumid on each side; apical lamella of aedeagus long, slightly bent to left.

Based on elytral microsculpture and male sternum, Pterostichus agilis is most similar to Pterostichus camelus sp. n. and Pterostichus zhygealu sp. n. For comparisons between them see the diagnosis of Pterostichus zhygealu sp. n.

Supplemental description.

Male sternum. Penultimate sternum of males faintly tumid on each side, tumidities close to primary setae, middle region between tumidities slightly depressed (Fig. 116); terminal sternum of males without special structures. Male genitalia. Median lobe of male genitalia bent approx 90 degrees, apex gradually and slightly bent ventrally (Fig. 37A); ventral margin straight in middle, faintly sinuate before apex; dorsal margin gradually curved; apical orifice large, slightly turned to left side, not opened on ventral side; apical lamella long, approx half length of apical orifice, laminate, not thickened; in dorsal view, apical lamella somewhat inclined right, approx triangular with rounded apex, apex a little prolonged, slightly bent to left, not hooked; apical lamella length approx 1.5 times its basal width (Fig. 37B). Right paramere straight and slender, length approx three times greatest width, apex rounded (Fig. 37C). Endophallus (Fig. 37D, E, F) bent to ventral side across apical lamella; gonopore (gp) located at level a little beyond apical lamella, pointing to aedeagal base; area around left face of gp decorated with fine scales. Four distinct lobes recognized, the three (vb-I, vb-II, va) located on ventral side of endophallus strongly chitinized: ventral-basal lobe I (vb-I) close to left margin of apical lamella base, very small, upper surface decorated with heavy spines and strongly chitinized, lower surface membranous; ventral-basal lobe II (vb-II) larger than vb-I, half chitinized half membranous, apex of chitinized right surface spined and slightly enlarged, membranous left surface with elongate apex, forming a digitiform extension on left side (in dorsal view); ventral-apical lobe (va) close to apex of apical lamella, evenly chitinized, without membranous region, approx same length as vb-II, broadly triangular with long apex; right lobe (rl) small and rounded, decorated with fine scales, located on right side of endophallus, close to gp. Female genitalia. Spermatheca with seminal canal approx 3.5 times as long as receptaculum; receptaculum capitate (Fig. 59), club approx two fifths length of receptaculum; spermathecal gland slightly expanded; seminal canal inserted at base of common oviduct, base of seminal canal sclerotized. Stylomere II with two or three ensiform setae at outer margin, and two near middle of inner margin; two short nematiform setae located in a furrow near apex. Female sternum VIII (Fig. 74B) with dense and fine spines on posterior margin; posterior margin slightly rounded, shallowly notched in middle; posterior region well chitinized, anterior region also; middle transparent region V-shaped, almost adjacent to posterior notch in middle. Female tergum VIII (Fig. 74A) evenly chitinized except for darker patches near anterior corner, without spots.

Distribution.

So far, this species is known only from Luojishan Mountain in Puge County of south Sichuan (Map 2). The highest peak of Luojishan is 4359 m high. We explored this mountain in 2012. This species was found from altitudes ranging from 2549-3859 m, but most specimens were collected above 3400 m.

Affinities.

Pterostichus agilis is closest to Pterostichus zhygealu sp. n. For details see the discussion under Pterostichus zhygealu sp. n. and agilis -group below.

Remarks.

The holotype is teneral. Its genitalia were distorted when mounting in eupral film. The illustration of the genitalia in the original literature is inadequate, so a redescription is provided of the male genitalia herein based on mature specimens.