Horniella simplaria 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 : 28-32

9. Horniella simplaria Yin and Li , new species

Figs 16 A, 17; Map 1

Type material (1 ♂). Holotype, ♂, labeled ‘ CHINA, Guangxi, Dawangling [ca. 23°44’N, 106°17’ E], 1190 m, 6.viii.1999, J. R. Fellowes / Rougemont collection / Holotype [red], ♂, Horniella simplaria sp. n., det. Yin & Li, 2014, pcPH’.

Description. Male ( Fig. 16 A). Length 3.23 mm. Head longer than wide, HL 0.70 mm, HW 0.61 mm; anterolateral genal projections ( Fig. 17 C) weakly indicated, anterior margins oblique; median sulcus between antennal tubercles short; scapes ( Fig. 17 B) lacking expansion at basolateral margins; clubs ( Fig. 17 A) loosely formed by apical three moderately enlarged antennomeres; venter lacking lateral spines ( Fig. 17 D). Maxillary palpomeres II slightly broadened from base toward apex. Each eye composed of about 36 facets. Pronotum slightly longer than wide, PL 0.75 mm, PW 0.70 mm. Elytra wider than long, EL 0.89 mm, EW 1.24 mm; discal striae reaching apical 5/6 of elytral length. Protrochanters ( Fig. 17 E) lacking ventral spine, profemora with one short and one much longer ventral spine near base, ventral margin broadly expanded at basal 1/3, protibiae ( Fig. 17 F) each with one triangular projection at mesal margin near apical 1/3, and one small apical spur; mesotrochanters, mesofemora ( Fig. 17 G) and mesotibiae ( Fig. 17 H) simple; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 0.89 mm, AW 1.31 mm, tergite IV (first visible tergite) with median carina extending to half tergal length, lacking lateral discal carinae, tergite V lacking median carina. Sternite IX ( Fig. 17 I) with well-defined apical section, apical half well-sclerotized and basal half membranous. AeL 0.61 mm; aedeagus ( Figs 17 J–L) with nearly symmetric median lobe except for strongly pointed margin on right side; endophallus composed of one broad, semi-membranous sclerite with angular apex, and one elongate, securiform sclerite.

Female. Unknown.

Differential diagnosis. This is a distinctive species placed as a member of the H. hirtella group. The male is similar to those of H. hirtella by sharing the presence of one short and one much longer spine on ventral margin of the protibiae, and a similar form of the aedeagus. Horniella simplaria is the only member of the group that has a distinctive triangular projection on the mesal margin of the protibia at its apical 1/3. The endophallus of this species consists of two sclerites, but lacks small denticles on the membranous part, which are commonly present in other species of the group.

Distribution. South China: Guangxi ( Map 1 ).

Collection notes. Unknown.

Etymology. The specific name indicates a simple aedeagal form of the new species.

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 17. Male diagnostic features of Horniella simplaria 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.