Horniella tianmuensis Yin and Li

Yin, Zi-Wei & Li, Li-Zhen, 2014, Revision of the Oriental genus Horniella Raffray (Coleoptera, Staphylinidae, Pselaphinae), Zootaxa 3850 (1), pp. 1-83 : 32

10. Horniella tianmuensis Yin and Li , new species

Figs 16 B, 18; Map 1

Type material (1 ♂). Holotype, ♂, labeled ‘ CHINA: Zhejiang Prov., Lin’an City, Tianmushan , alt. 350 m, 15.viii.2010, Liang TANG leg. [ca. 30°19’07’’ N, 119°26’40’’ E, leaf litter, sifted near a creek] / Holotype [red], ♂, Horniella tianmuensis sp. n., det. Yin & Li, 2014, SNUC’.

Description. Male ( Fig. 16 B). Length 3.79 mm. Head slightly wider than long, HL 0.78 mm, HW 0.81 mm; anterolateral genal projections ( Fig. 18 C) distinct, anterior margins nearly rounded; median sulcus between antennal tubercles short; scapes ( Fig. 18 B) greatly expanded at basolateral margins; clubs ( Fig. 18 A) loosely formed by apical three moderately enlarged antennomeres; venter with pair of moderately thick lateral spines ( Fig. 18 D). Maxillary palpomeres II stout, broadened at middle. Each eye composed of about 35 facets. Pronotum slightly longer than wide, PL 0.79 mm, PW 0.76 mm. Elytra wider than long, EL 1.06 mm, EW 1.54 mm; discal striae reaching near apical 2/3 of elytral length. Protrochanters and profemora ( Fig. 18 E) each with one distinct ventral spine, protibiae ( Fig. 18 F) each with small preapical spur; mesotrochanters ( Fig. 18 G) each with one sharp ventral spine, mesofemora simple, mesotibiae ( Fig. 18 H) each with small preapical denticle on mesal margin; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.16 mm, AW 1.63 mm, tergite IV (first visible tergite) with short median carina extending to ca. apical 1/5 of tergal length, tergite V lacking median carina. Sternite IX ( Fig. 18 I) nearly oval, with well-sclerotized apical half and membranous basal half. AeL 0.97 mm; aedeagus ( Figs 18 J–L) with greatly asymmetric median lobe, right half of median lobe greatly protruding apicad in dorso-ventral view; endophallus composed of two elongate sclerites.

Female. Unknown.

Differential diagnosis. This species is placed as a member of the H. centralis group. The male is similar to that of H. confragosa by sharing the nearly rounded anterior margins of the anterolateral genal projections, the greatly expanded basolateral margins of the scapes, and similar placement and form of spines on the fore and mid legs. They can be best separated, when the distributions are taken into consideration, by the apex of the median lobe being nearly truncate in lateral view in H. tianmuensis , and the endophallus is formed from two long sclerites, while H. confragosa has the aedeagal median lobe with a pointed apex in lateral view, and has the endophallus with two elongate, but much shorter sclerites.

Distribution. East China: Zhejiang ( Map 1 ).

Collection notes. The single male adult was collected from sifted leaf litter in a mixed broad-leaved forest.

Etymology. The new species is named after its type locality, the West Tianmu Shan.

Figures

MAP 1. Distribution of Horniella species in China.

FIGURE 16. Male habitus of Horniella species. A. H. simplaria sp. n. B. H. tianmuensis sp. n. Scales: 1.0 mm.

FIGURE 18. Male diagnostic features of Horniella tianmuensis sp. n. A. Antenna. B. Scape. C. Right half of head, in dorsal view. D. Head, in lateral view. E. Protrochanter and profemur. F. Protibia. G. Mesotrochanter and mesofemur. H. Mesotibia. I. Sternite IX. J. Aedeagus, in dorsal view. K. Same, in lateral view. L. Same, in ventral view. Scales: 0.3 mm, except B, I = 0.1 mm.