Triomicrus nanlingensis Shen and Yin

Shen, Jia-Wei, Yin, Zi-Wei & Li, Li-Zhen, 2015, Six new species of Triomicrus Sharp from southern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4044 (4), pp. 585-595 : 591-592

Triomicrus nanlingensis Shen and Yin , new species

( Fig. 5 )

Type material (3 ♂♂). Holotype: China: ♂, labeled ‘ China: Guangdong Province, Ruyuan Hsien (viiAEA), Nanling N. R. (*≷), Laopengerdui (+*∴), 24°54’57’’N, 113°02’10’’E, mixed forest, leaf litter, sifted, 850 m, 03.v.2015, Peng, Tu, Zhou leg.’ ( SNUC). Paratypes: China: 1 ♂, labeled ‘ China: Guangdong Province, Ruyuan Hsien, Nanling N. R., Disilindao (), 24°55’47’’N, 112°59’50’’E, mixed forest, leaf litter, wood, sifted, 1500 m, 05.v.2015, Peng, Tu, Zhou leg.’ ( SNUC); 1 ♂, also from Nanling N. R., ‘Walkway, 24°55’57’’N, 113°00’18’’E, mixed forest, leaf litter, wood, sifted, 1220 m, 28.iv.2015, Peng, Tu, Zhou leg.’ ( SNUC).

Diagnosis. Antennomere XI with moderately prominent disc-like protuberance near base. Head with median vertexal carina. Pronotum entirely and densely punctate. Elytral subhumeral sulci long, reaching level of metacoxae. Profemora simple, protrochanters and protibiae lacking protuberance, mesotibiae lacking spur. Apical lamina of abdominal sternite VII composed of two sclerites. Aedeagus with right paramere curved laterally, internal sac bearing several sclerotized spines and several densely hairy sclerites.

Description. Male ( Fig. 5 A). Length 1.90–2.05 mm. Head longer than wide, HL 0.38–0.42 mm, HW 0.40– 0.42 mm, with median vertexal carina; lateral portions of frons finely and sparsely punctate; each eye composed of about 32 facets. Antennomere XI ( Fig. 5 B, 5C) with moderately prominent disc-like protuberance near base, diameter of protuberance about one-sixth of segmental length. Pronotum wider than long, PL 0.40–0.45 mm, PW 0.45–0.47 mm, with fine and sparse punctation. Profemora simple, protrochanters, and protibiae lacking protuberance, mesotibiae lacking spur. Elytra wider than long, EL 0.73–0.75 mm, EW 0.78–0.80 mm, smooth; subhumeral sulci long, reaching level of metacoxae. Abdomen wider than long, AL 0.35–0.41 mm, AW 0.70–0.73 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to three-fifths of tergal length; abdominal sternite VII modified ( Fig. 5 D), with apical lamina composed of two sclerites, left one narrowed near base, rounded at apex of lateral margin, right one very small. Length of aedeagus ( Fig. 5 E) 0.29 mm, right paramere curved laterally, internal sac bearing several sclerotized spines and several densely hairy sclerites.

Female. Unknown.

Discussion. The new spices is morphologically closet to T. damingensis Shen, Yin & Li, 2015 in a similar general habitus ( Fig. 5 A), the form of the protuberance of the antennomere XI ( Fig. 5 B, 5C) and the structure of the aedeagus ( Fig. 5 E). Males of these two species can be separated by the presence of two sclerites on the abdominal sternite VII in T. nanlingensis ( Fig. 5 D), whereas T. damingensis only has one sclerite on the sternite VII.

Distribution. Southern China: Guangdong.

Etymology. This species is named after the type locality, Nanling N. R.

Figures

FIGURE 5. Diagnostic characters of Triomicrus nanlingensis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D, E = 0.1 mm.