Horniella sichuanica 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

8. Horniella sichuanica Yin and Li , new species

Figs 13 B, 15, 48E; Map 1

Type material (4 ♂♂, 4 ♀♀). Holotype, ♂, labeled ‘ CHINA: Sichuan, Tianquan County, mountain near Liang’lu Township, 29°55’46’’ N, 102°23’33’’ E, 1500–1700 m, (mixed leaf litter, grass, sifted), 10.vii.2012, Dai, Peng & Yin leg. / Holotype [red], ♂, Horniella sichuanica sp. n., det. Yin & Li, 2014, SNUC’ . Paratypes: 3 ♂♂, 4 ♀♀, same label data as holotype, each bears a yellow type label similar to that of the holotype except ‘ Paratype, ♂ (or ♀)’ ( SNUC).

Description. Male ( Fig. 13 B). Length 3.58–3.77 mm. Head about as long as wide, HL 0.67–0.69 mm, HW 0.69–0.72 mm; anterolateral genal projections ( Fig. 15 C) distinct, anterior margins nearly rounded; median sulcus between antennal tubercles short; scapes ( Fig. 15 B) greatly expanded at basolateral margins; clubs ( Fig. 15 A) loosely formed by apical three moderately enlarged antennomeres; venter with pair of short lateral spines ( Fig. 15 D). Maxillary palpomeres II stout, broadened at middle. Each eye composed of about 35 facets. Pronotum about as long as wide, PL 0.69–0.73 mm, PW 0.63–0.68 mm. Elytra wider than long, EL 0.91–0.98 mm, EW 1.13–1.19 mm; discal striae shallow, reaching apical 3/4 of elytral length. Protrochanters and profemora ( Fig. 15 E) each with one distinct ventral spine, protibiae ( Fig. 15 F) each with one small apical denticle; mesotrochanters ( Fig. 15 G) each with one large ventral spine, mesofemora simple, mesotibiae ( Fig. 15 H) each with small preapical denticle on mesal margin; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.31–1.37 mm, AW 1.30–1.32 mm, tergite IV (first visible tergite) with short median carina extending to apical 1/5 of tergal length, lacking discal carinae, tergite V lacking median carina. Sternite IX ( Fig. 15 I) nearly oval, with wellsclerotized apical half and membranous basal half. AeL 0.71 mm; aedeagus ( Figs 15 J–L) with greatly asymmetric median lobe, left half of median lobe greatly protruding apicad in dorso-ventral view; endophallus composed of two elongate sclerites.

Female. Similar to male in general appearance; scapes not expanded at basolateral margins; each eye composed of about 33 facets; profemora each with two ventral spines near base, mesotrochanters lacking ventral spine. BL 3.18–3.32 mm, HL 0.66–0.69 mm, HW 0.63–0.67 mm, PL 0.68–0.72 mm, PW 0.67–0.68 mm, EL 0.86–0.88 mm, EW 1.30–1.36, AL 0.98–1.03 mm, AW 1.32–1.42 mm. Genital complex ( Fig. 48 E) with membranous apical part, and more strongly sclerotized basal part.

Differential diagnosis. This species is placed in the H. centralis group. Males are externally similar to those of H. confragosa and H. tianmuensis as discussed above. Horniella sichuanica can be efficiently separated by the aedeagal median lobe having the left half being greatly protruding, while H. confragosa and H. tianmuensis have an opposite position of this character state.

Distribution. Southwest China: Sichuan ( Map 1 ).

Collection notes. Adults of this species were collected from a leaf litter sample in a mixed forest by sifting.

Etymology. The specific name is taken from ‘Sichuan Province’, where the type locality lies.

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 15. Male diagnostic features of Horniella sichuanica 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.

FIGURE 48. Female genital complex of Horniella species, in dorsal view. A. H. centralis (Population from Daba Shan). B. H. centralis (Population from Qinling). C. H. hongkongensis. D. H. nakhi. E. H. sichuanica. F. H. himalayica. G. H. hirtella. H. H. asymmetrica. I. H. burckhardti. Scales: 0.2 mm.