Horniella schwendingeri 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 : 60-61

21. Horniella schwendingeri Yin and Li , new species

Figs 37 A, 38; Map 4

Type material (1 ♂). Holotype, ♂, labeled ‘ Thailand, Doi Suthep, Chiang Mai Dist ., 1500 m, 19.i.1991, P. Schwendinger / Holotype [red], ♂, Horniella schwendingeri sp. n., det. Yin & Li, 2014, MHNG’ .

Description. Male ( Fig. 37 A). Length 4.06 mm. Head slightly wider than long, HL 0.73 mm, HW 0.81 mm; anterolateral genal projections ( Fig. 38 C) distinct, anterior margin slightly sinuate; median sulcus between antennal tubercles short; scapes ( Fig. 38 B) slightly angularly expanded at lateral margins; clubs ( Fig. 38 A) formed by apical three moderately enlarged antennomeres; venter with thin lateral spines ( Fig. 38 D). Maxillary palpomeres II stout, widest at middle. Each eye composed of about 50 facets. Pronotum slightly longer than wide, PL 0.79 mm, PW 0.73 mm. Elytra wider than long, EL 1.02 mm, EW 1.52 mm; shallow discal striae reaching apical 3/4 of elytral length. Protrochanters and profemora ( Fig. 38 E) each with one long ventral spine, protibiae ( Fig. 38 F) simple, mesotrochanters ( Fig. 38 G) each with conspicuously long ventral spine, mesotibiae ( Fig. 38 H) with row of preapical denticles; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.52 mm, AW 1.02 mm, tergite IV (first visible tergite) lacking median carina, lacking lateral discal carinae, replaced by pair of obliquely placed incisions; tergite V lacking median carina. Sternite IX ( Fig. 38 I) with well-sclerotized apical half, and moderately sclerotized basal half. AeL 0.75 mm; aedeagus ( Figs 38 J–L) median lobe strongly asymmetric, left half greatly protruding apicad to form broad apical lobe; endophallus composed of one broad and elongate membranous lamina with strongly curved sclerite attached on its apical portion, and one well elongate sclerite beside lamina.

Female. Unknown.

Differential diagnosis. This is the only species of the H. centralis group known to occur outside China. The large size of the body, in combination with the transverse head, the extremely long ventral spine of the mesotrochanters, and the aedeagus with a broad apical projection readily separate this species from all Chinese congeners of the group.

Distribution. Thailand: Chiang Mai ( Map 4 ).

Collection notes. Unknown.

Etymology. This species is dedicated to Peter Schwendinger, an arachnologist of MHNG, who collected the holotype and many other specimens treated in the present study.

Figures

MAP 4. Distribution of Horniella species in Thailand.

FIGURE 37. Male habitus of Horniella species. A. H. schwendingeri sp. n. B. H. philippina sp. n. Scales: 1.0 mm.

FIGURE 38. Male diagnostic features of Horniella schwendingeri 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.