Horniella schuelkei 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 : 25-28

7. Horniella schuelkei Yin and Li , new species

Figs 13 A, 14; Map 1

Type material (1 ♂). Holotype, ♂, labeled ‘ CHINA: Yunnan, Dali Bai Aut. Pref ., Jizu Shan , path to cable car, 37 km NE Dali , 25°58’ N, 100°23’ E, 2450 m, mixed forest, sifted from litter, moss & pineapples, 5.ix.2009, leg. M. Schülke [CH09-29] / Holotype [red], ♂, Horniella schuelkei sp. n., det. Yin & Li, 2014, pcMS’.

Description. Male ( Fig. 13 A). Length 3.55 mm. Head longer than wide, HL 0.74 mm, HW 0.64 mm; anterolateral genal projections ( Fig. 14 C) distinct, anterior margins obliquely concave; median sulcus between antennal tubercles short; scapes ( Fig. 14 B) slightly angularly expanded at basolateral margins; clubs ( Fig. 14 A) loosely formed by apical three moderately enlarged antennomeres; venter with pair of markedly long lateral spines ( Fig. 14 D). Maxillary palpomeres II stout, broadened at middle. Each eye composed of about 30 facets. Pronotum about as long as wide, PL 0.68 mm, PW 0.67 mm. Elytra wider than long, EL 0.91 mm, EW 1.40 mm; discal striae reaching apical 3/4 of elytral length. Protrochanters and profemora ( Fig. 14 E) each with one short and one long ventral spine, protibiae ( Fig. 14 F) each with one long apical projection; mesotrochanters ( Fig. 14 G) each with one big sharp ventral spine, mesofemora simple, mesotibiae ( Fig. 14 H) with apical row of small denticles and distinct apical projection; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.22 mm, AW 1.41 mm, tergite IV (first visible tergite) with short median carina extending to ca. apical 1/4 of tergal length, lateral discal carinae short, indistinct, tergite V lacking median carina. Sternite IX ( Fig. 14 I) nearly oval, with wellsclerotized apical half and membranous basal half. AeL 0.66 mm; aedeagus ( Figs 14 J–L) with right half of median lobe greatly protruding in dorso-ventral view; endophallus composed of one long and two short sclerites.

Female. Unknown.

Differential diagnosis. This species is placed as a member of the H. centralis group. It is similar to H. nakhi , as discussed above. The two species can be separated by the distinctly longer apical projection of the protibiae, the short, but distinct apical projection of the mesotibiae, and the aedeagal endophallus with one elongate and two short sclerites in H. schuelkei , while H. nakhi has a shorter, truncate apical projection of the protibiae, apical projections of the mesotibiae are lacking, and the aedeagal endophallus has two long sclerites.

Distribution. Southwest China: Yunnan ( Map 1 ).

Collection notes. The single male was collected from sifted litter simple in a mixed forest.

Etymology. The new species is named after our friend Michael Schülke, who made his large pselaphine collection available to us for study.

Figures

MAP 1. Distribution of Horniella species in China.

FIGURE 13. Male habitus of Horniella species. A. H. schuelkei sp. n. B. H. sichuanica sp. n. Scales: 1.0 mm.

FIGURE 14. Male diagnostic features of Horniella schuelkei 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.