Horniella nakhi 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

6. Horniella nakhi Yin and Li , new species

Figs 10 B, 12, 48D; Map 1

Type material (1 ♂, 2 ♀♀). Holotype, ♂, labeled ‘ CHINA: N-Yunnan [C03-03], Lijiang Naxi Aut. Co., 3 km NW Yongsheng , 53 km WSW Lijiang , 26°41’8’’N, 110°43’1’’E, 1950–2000 m, SE slope, secondary broad-leaved forest, 14.viii.2003, leg. M. Schülke / Sammlung, M. Schülke, Berlin / M. SCHÜLKE Coll. Staphylinidae , Pselaphinae , Hamotopsis sp. 3, S. Nomura det., 2005 / Holotype [red], ♂, Horniella nakhi sp. n., det. Yin & Li, 2014, pcMS’ . Paratypes: 2 ♀♀, same label data as the holotype, each bears a yellow type label similar to that of the holotype except ‘ Paratype ♀ ’ (pcMS).

Description. Male ( Fig. 10 B). Length 3.59 mm. Head slightly longer than wide, HL 0.76 mm, HW 0.70 mm; anterolateral genal projections ( Fig. 12 C) distinct, anterior margins obliquely concave; median sulcus between antennal tubercles short and moderately deep; scapes ( Fig. 12 B) slightly angularly expanded at basolateral margins; clubs ( Fig. 12 A) loosely formed by apical three moderately enlarged antennomeres; venter with pair of markedly long lateral spines ( Fig. 12 D). Maxillary palpomeres II stout, broadened at middle. Each eye composed of about 38 facets. Pronotum slightly longer than wide, PL 0.74 mm, PW 0.71 mm. Elytra wider than long, EL 0.97 mm, EW 1.44 mm; discal striae reaching apical 3/4 of elytral length. Protrochanters and profemora ( Fig. 12 E) each with one distinct ventral spine, protibiae ( Fig. 12 F) each with one large, truncate apical projection; mesotrochanters ( Fig. 12 G) each with one big ventral spine, mesofemora simple, mesotibiae ( Fig. 12 H) with apical row of small denticles; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.12 mm, AW 1.43 mm, tergite IV (first visible tergite) with median carina extending to apical 1/5 of tergal length, lateral discal carinae short, indistinct, tergite V lacking median carina. Sternite IX ( Fig. 12 I) nearly oval, with well-sclerotized apical half and membranous basal half. AeL 0.73 mm; aedeagus ( Figs 12 J–L) with right half of median lobe greatly protruding in dorso-ventral view; endophallus composed of two long sclerites close to each other.

Female. Similar to male in general appearance; scapes not expanded at basolateral margins; each eye composed of about 35 facets; profemora each with two subequal ventral spines near base, mesotrochanters lacking ventral spine. BL 3.39–3.61 mm, HL 0.71–0.72 mm, HW 0.62–0.65 mm, PL 0.70–0.73 mm, PW 0.68–0.69 mm, EL 0.87–0.93 mm, EW 1.34–1.43, AL 1.11–1.23 mm, AW 1.38–1.52 mm. Genital complex ( Fig. 48 D) with membranous apical portion, and strongly sclerotized basal portion.

Differential diagnosis. This species is placed as a member of the H. centralis group. It seems H. nakhi and H. schuelkei (probably also including H. falcis ) form a smaller complex by sharing the obliquely concave anterior margin of the anterolateral genal projections, slightly expanded basolateral margins of the scapes, similar form and placement of spines on the fore and mid legs, short median carina on tergite IV, and similar aedeagal forms. H. nakhi can be separated by the shorter, truncate apical projection of the protibiae, the lack of an apical projection of the mesotibiae, and the aedeagal endophallus with two long sclerites; in contrast H. schuelkei has a distinctly longer apical projection of the protibiae, a shorter, but distinct apical projection of the mesotibiae, and the aedeagal endophallus has one elongate and two short sclerites. For separation of H. falcis from the above two species, refer to the ‘Differential diagnosis’ section under that species.

Distribution. Southwest China: Yunnan ( Map 1 ).

Collection notes. Though not explicitly stated by the label data, adults were possibly collected by sifting leaf litter in a secondary broad-leaved forest.

Etymology. The specific name ‘ nakhi ’ is taken from the name of an ethnic group of people inhabiting the type locality.

Figures

MAP 1. Distribution of Horniella species in China.

FIGURE 10. Male habitus of Horniella species. A. H. hongkongensis sp. n. B. H. nakhi sp. n. Scales: 1.0 mm.

FIGURE 12. Male diagnostic features of Horniella nakhi 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.