Horniella philippina 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 : 63

22. Horniella philippina Yin and Li , new species

Figs 37 B, 39, 49F; Map 5

Type material (1 ♂, 2 ♀♀). Holotype, ♂, labeled ‘ Mt. Makiling , Lagunas , LUZON, rainfor. litter / R. A. Mores, Jan. 1968, berlesate / Holotype [red], ♂, Horniella philippina sp. n., det. Yin & Li, 2014, MHNG’ . Paratypes: 1 ♀, labeled ‘ PHILIPPINES: Mt., Makiling , Laguns Prov., 4 km SE Los Banos , 07.v.1977 / berlese, rotten figs, L.E. Watrous’ ( MHNG) ; 1 ♀, labeled ‘ Philippines, Luzon: Lagunas , Mt. Banahaw nr. school about 1 km from Kinabuhayan , 500 m, degraded rainforest, 26.xi.1995 [probably leg. J. Kodada]’ ( MHNG) . Each paratype bears a yellow type label similar to that of the holotype except ‘ Paratype ♂ (or ♀)’.

Description. Male ( Fig. 37 B). Length 3.09 mm. Head slightly longer than wide, HL 0.62 mm, HW 0.56 mm; anterolateral genal projections ( Fig. 39 C) weakly indicated; median sulcus between antennal tubercles short; scapes ( Fig. 39 B) lacking expansion at lateral margins; clubs ( Fig. 39 A) formed by apical three moderately enlarged antennomeres; venter lacking lateral spines ( Fig. 39 D). Maxillary palpomeres II slightly broadened from base toward apex. Each eye composed of about 45 facets. Pronotum slightly longer than wide, PL 0.65 mm, PW 0.62 mm. Elytra wider than long, EL 0.79 mm, EW 1.17 mm; discal striae reaching apical 3/4 of elytral length. Protrochanters simple, profemora ( Fig. 39 E) each with two small ventral spines near base, protibiae ( Fig. 39 F), mesotrochanters, and mesofemora ( Fig. 39 G) simple, mesotibiae ( Fig. 39 H) with indistinct apical spur; tarsomeres II normal, not extending to beneath tarsomeres III. Abdomen large, AL 1.03 mm, AW 1.20 mm, tergite IV (first visible tergite) with median carina extending to near half of tergal length, lacking lateral discal carinae, tergite V lacking median carina. Sternite IX ( Fig. 39 I) elongate, well-sclerotized. AeL 0.68 mm; aedeagus ( Figs 39 J–L) with elongate, nearly symmetric median lobe, apex rounded; endophallus composed of large, oval membranous part with many small denticles at apex.

Female. Similar to male in general appearance; each eye composed of about 40 facets; profemora each with two small ventral spines near base, metatibiae simple at apex. BL 2.92–3.05 mm, HL 0.62–0.65 mm, HW 0.56–0.59 mm, PL 0.62–0.67 mm, PW 0.58–0.62 mm, EL 0.74–0.78 mm, EW 1.16–1.22 mm, AL 0.94–0.95 mm, AW 1.20–1.23 mm. Genital complex ( Fig. 49 F) composed of transverse sclerite moderately sclerotized at middle and membranous at lateral parts.

Differential diagnosis. This species is placed as a member of the H. hirtella group. Males share a similar general appearance with H. awana and H. cibodas (both described below), but can be readily separated from both by the presence of an elongate median lobe with a rounded apex of the aedeagus, and the endophallus having a large, oval, elongate membranous portion with many small denticles at the apex. Horniella awana has a stouter form of the aedeagus, while H. cibodas has a small, sharp apical sclerite at the apex of the endophallus. The elongate median lobe and endophallus that lacks any sclerite of H. philippina is shared with H. prolixo . These two species can be easily separated by the simple metatibiae of the former species while the latter species has a strongly modified apical portion of the metatibiae.

Distribution. Philippines: Laguna ( Map 5 ).

Collection notes. Individuals were collected from litter samples by use of Berlese funnels in rainforests.

Etymology. The species is named after the Philippines where the type locality lies.

Figures

MAP 5. Distribution of Horniella species in the Philippines.

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

FIGURE 39. Male diagnostic features of Horniella philippina 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.