Pseudopsis (Pseudopsis) pengi, Yin, 2021

Yin, Zi-Wei, 2021, Two new species and additional records of Pseudopsis Newman from China (Coleoptera: Staphylinidae: Pseudopsinae), Journal of Natural History 55 (15 - 16), pp. 933-951 : 940-946

Pseudopsis (Pseudopsis) pengi sp. nov.

( Figures 4 , 6 (a,b), 8(d), 11(c))

Type material (3 exx.)

Holotype, ♂: ‘ China: Shanxi, Jiaocheng Co., Pangquangou N. R., Erhezhuang , 37°49 ′ N, 111°29 ′ E, alt., 1700 m, 10.ix.2011, Z. Peng leg., 山西庞泉沟二和庄.’ ( SNUC) . Paratypes, 2 ♂♂: same collection data as the holotype ( SNUC).

Description

Male. Body ( Figure 4 (a)) length (combined length of head, pronotum, scutellum, elytra and abdomen) 3.4–4.2 mm, fore body length (length of body minus abdomen) 1.85–2.14 mm. Head dark brown, pronotum and elytra yellowish brown, elytral disc darker in colour than surrounding areas, abdomen dark reddish brown, antennae, legs, mouthparts reddish brown. Length of head ( Figure 4 (b)) from anterior margin of clypeus to anterior margin of pronotum 0.51–0.59 mm, maximum width across eyes 0.58–0.60 mm. Length of antennae 0.81–0.87 mm. Pronotum ( Figure 4 (b)) transverse, length along midline 0.60–0.69 mm, maximum width 0.83–0.92 mm; sides rounded. Elytra ( Figure 4 (c)) transverse, length along suture (excluding scutellum) 0.63–0.70 mm, maximum width 0.95–1.04 mm; epipleural carinae visible after middle in dorsal view. Length of abdomen along middle 1.35–2.13 mm; posterior margin of sternite IX ( Figure 8 (d)) hardly emarginate.

Aedeagus ( Figure 6 (a)) asymmetrical at base, length 0.70 mm; median lobe moderately elongate, slender, gradually narrowing apicad, apex in lateral view deflexed ventrally, in ventral view more or less truncate. Endophallus ( Figure 6 (b)) in repose approximately nine-tenths length of median lobe, apical part with numerous long, slender spines on right side, and with group of much shorter and smaller spines on left side, middle part comprising rows of broad triangular spines and numerous weakly sclerotised ones, basal part having only fine, weakly-sclerotised spines. Parameres ( Figure 6 (a)) slightly sinuate in ventral view; apices of parameres extending below apex of median lobe; apical seta moderately long, unpigmented.

Female. Unknown.

Comparative notes

All three males were dissected to check the morphological variation of the aedeagus, but none was detected. This species is most similar to P. gansuensis distributed in the west and middle part of the Qinling Mountains and Gansu in sharing the non-pointed apex of the median lobe of the aedeagus, and a similar general structure of the endophallus. Pseudopsis pengi sp. nov. is distributed outside the range of Qinling, found rather in the north-east at the south-north oriented Lüliang Mountains in Shanxi. The new species differs from P. gansuensis in the relatively much broader apical portion of the median lobe of the aedeagus, the much longer parameres, and the apical part of the endophallus being composed of many minute spines overlapping one another on the left side. In both populations of P. gansuensis from Gansu and Shaanxi, the aedeagus is much narrower at the apex, the parameres are distinctly shorter, and the apical part of the endophallus contains one to two rows of much larger, triangular spines. In addition, the posterior margin of sternite IX of the new species is less emarginate than that of P. gansuensis .

Distribution

China: Shanxi ( Figure 11 (c)).

Etymology

The new species is named after my colleague Zhong Peng, who collected the type series.

Remarks

This species represents the northernmost occurrence of the genus in China.

Figures

Figure 4. Pseudopsis pengi sp. nov. (a) Dorsal habitus; (b) head and pronotum; (c) right elytron. Scale bars: a, b = 0.5 mm; c = 0.3 mm.

Figure 6. Aedeagus (a, c) and enlarged endophallus (b, d) of Pseudopsis pengi sp. nov. (a, b) and P. serrata sp. nov. (c, d). Scale bars: 0.2 mm.

Figure 8. Aedeagus (a), enlarged endophallus (b), and abdominal segment IX of Pseudopsis suchi (f), P. gansuensis (c), P. pengi sp. nov. (d), and P. serrata sp. nov. (e). Scale bars: 0.2 mm.

Figure 11. Distribution of Pseudopsis in Asia. (a) P. hermani Zerche, 1998; (b) P. himalayensis Herman, 1975; (c) P. pengi sp. nov.; (d) P. prolixa Herman, 1975; (e) P. puetzi Zerche, 1998; (f) P. schuelkei Zerche, 1998; (g) P. serrata sp. nov.; (h) P. smetanai Zerche, 1998.