Horniella smetanai 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 : 72

26. Horniella smetanai Yin and Li , new species

Figs 43 B, 45, 49H; Map 6

Type material (4 ♂♂, 1 ♀). Holotype, ♂, labeled ‘ SABAH: Crocker Ra., 1200 m, km 63 rte Kota Kinabalu – Tambunan , 19.vi.1987, Burckhardt- Löbl / Holotype [red], ♂, Horniella smetanai sp. n., det. Yin & Li, 2014, MHNG’ . Paratypes: 1 ♂, same data as the holotype ; 1 ♂, 1 ♀, same data except ‘ 1270 m, km 60 rte Kota Kinabalu–Tambunan , 17.vi.1987 ’ ; 1 ♂, labeled ‘ BORNEO Sabah Mt. Kinab. N. P. , Por. H. S. area Eastern Ridge , Tr. 790 m, 17.viii.1988, A. Smetana [ B119 ]’. All paratypes are housed in MHNG, and each bears a yellow type label similar to that of the holotype except ‘ Paratype ♂ (or ♀)’.

Description. Male ( Fig. 43 B). Length 3.54–3.64 mm. Head distinctly longer than wide, HL 0.79–0.81 mm, HW 0.62–0.68 mm; anterolateral genal projections ( Fig. 45 C) weakly indicated; median sulcus between antennal tubercles short; scapes ( Fig. 45 B) lacking expansion at lateral margins; clubs ( Fig. 45 A) formed by apical three antennomeres, each distinctly elongate; venter lacking lateral spines ( Fig. 45 D). Maxillary palpomeres II greatly elongate, slightly broadened at apical 1/3. Each eye composed of about 40–45 facets. Pronotum longer than wide, PL 0.81–0.84 mm, PW 0.71–0.73 mm. Elytra wider than long, EL 0.88–0.91 mm, EW 1.34–1.38 mm; discal striae reaching apical 4/5 of elytral length. Protrochanters simple, profemora ( Fig. 45 E) each with two small ventral denticles at base and basal 1/3, protibiae ( Fig. 45 F), mesotrochanters, mesofemora ( Fig. 45 G), and mesotibiae ( Fig. 45 H) simple; tarsomeres II extending to midlength of tarsomeres III. Abdomen large, AL 1.06–1.08 mm, AW 1.31–1.32 mm, tergite IV (first visible tergite) with median carina extending to near tergal apex, lacking lateral discal carinae, tergite V with thin median carina extending to half of tergal length. Sternite IX ( Fig. 45 I) with wellsclerotized apical portion and less sclerotized basal portion. AeL 0.61 mm; aedeagus ( Figs 45 J–L) with apically asymmetric median lobe, apex strongly extending; endophallus composed of single slender sclerite with broadened base.

Female. Similar to male in general appearance; each eye composed of about 38–42 facets; Profemora simple. BL 3.73–3.80 mm, HL 0.84–0.87 mm, HW 0.65–0.68 mm, PL 0.85–0.86 mm, PW 0.71–0.74 mm, EL 0.91–0.94 mm, EW 1.40–1.44 mm, AL 1.09–1.17 mm, AW 1.38–1.44 mm. Genital complex ( Fig. 49 H) well-sclerotized, composed of apical sclerite and a pair of triangular basal sclerites.

Differential diagnosis. This species belongs to the H. gigas group. Males can be separated from H. gigas by the much smaller body size, the simple protrochanters, and the more slender form of the aedeagus, while H. gigas is larger (over 4.0 mm), the protrochanters have a distinct ventral spine, and the aedeagus is much stouter in form. The lack of long hairs on the male mesofemora and metatibiae quickly separates H. smetanai from H. pilosa .

Distribution. East Malaysia: Sabah ( Map 6 ).

Collection notes. Individuals were collected from leaf litter samples by sifting and use of Winkler-Moczarski extractors.

Etymology. The new species is named after Aleš Smetana (Ottawa, Canada), in acknowledgment of his collection of some of the material used in this study.

Figures

MAP 6. Distribution of Horniella species in Malaysia.

FIGURE 43. Male habitus of Horniella species. A. H. pilosa sp. n. B. H. smetanai sp. n. Scales: 1.0 mm.

FIGURE 45. Male diagnostic features of Horniella smetanai 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 49. Female genital complex of Horniella species, in dorsal view. A. H. intricata. B. H. kaengkrachan. C. H. khaosabap. D. H. loebli. E. H. prolixo. F. H. philippina. G. H. pilosa. H. H. smetanai. I. H. cibodas. Scales: 0.2 mm.