Horniella dao 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 : 17

3. Horniella dao Yin and Li , new species

Figs 7 A, 8; Map 1

Type material (1 ♂). Holotype, ♂, labeled ‘ CHINA: Sichuan, Dujiangyan City, Qingchengshan Mt. , pass near Baiyun Temple , 30°56’55’’N, 103°28’28’’E, 1650 m, (bamboo, leaf, dead wood, sifted), 27.vii.2012, C.C. Dai, Z. Peng & Z.W. Yin leg. / HOLOTYPE [red], ♂, Horniella dao sp. n., det. Yin & Li, 2014, SNUC’.

Description. Male ( Fig. 7 A). Length 3.77 mm. Head slightly longer than wide, HL 0.77 mm, HW 0.73 mm; anterolateral genal projections ( Fig. 8 C) distinct, anterior margins evenly concave; median sulcus between antennal tubercles thin; scapes ( Fig. 8 B) slightly expanded at basolateral margins; clubs ( Fig. 8 A) loosely formed by apical three moderately enlarged antennomeres; venter with pair of thick lateral spines ( Fig. 8 D). Maxillary palpomeres II stout, broadened at near middle. Each eye composed of about 38 facets. Pronotum slightly longer than wide, PL 0.79 mm, PW 0.72 mm. Elytra wider than long, EL 0.98 mm, EW 1.45 mm; discal striae reaching about apical 3/4 of elytral length. Protrochanters and profemora ( Fig. 8 E) each with one distinct ventral spine, protibiae ( Fig. 8 F) with long apical spur; mesotrochanters ( Fig. 8 G) each with one ventral spine, mesofemora simple, mesotibiae ( Fig. 8 H) each with several preapical denticles on mesal margin, apex moderately projected; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.23 mm, AW 1.45 mm, tergite IV (first visible tergite) with thin median carina extending to 2/5 tergal length, lacking discal carinae, tergite V lacking median carina. Sternite IX ( Fig. 8 I) nearly oval, with well-sclerotized apical half and membranous basal half. AeL 0.98 mm; aedeagus ( Figs 8 J–L) with asymmetric median lobe, left half of median lobe greatly protruding apicad, apex nearly rounded in dorso-ventral view; endophallus composed of one elongate sclerite and one much shorter sclerite at base of long one.

Female. Unknown.

Differential diagnosis. This species is placed in the H. centralis group. As discussed above, males of this species share with H. centralis the evenly concave anterior margins of the anterolateral genal projections, the slightly expanded basolateral margins of the scapes, the long apical spur of the protibiae, similar apical projection of the mesotibiae, and similar placement of spines on the fore and mid legs. They can be separated by the left half of the aedeagal median lobe being greatly protruding apicad, and the aedeagal endophallus has one long sclerite and another much shorter sclerite at the base of the long one in H. dao , while H. centralis has the right half of the aedeagal median lobe greatly protruding apicad, and the endophallus is comprised of a single elongate sclerite.

Distribution. Southwest China: Sichuan ( Map 1 ).

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

Etymology. The specific name ‘ dao ’ is taken from ‘ Dao , or Tao’, a Chinese concept signifying ‘way’, ‘path’, ‘route’. The type locality, Qingcheng Shan, is one of the famous Taoist mountains in China.

Figures

MAP 1. Distribution of Horniella species in China.

FIGURE 7. Habitus of Horniella species. A. H. dao sp. n., male. B. H. falcis Yin & Li, 2010, female. Scales: 1.0 mm.

FIGURE 8. Male diagnostic features of Horniella dao 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.