Discoxenus katayamai Kanao & Maruyama, 2010

Kanao, Taisuke, Maruyama, Munetoshi & Sakchoowong, Watana, 2010, Two new species of Aleocharinae (Coleoptera, Staphylinidae) found in fungus gardens of Odontotermes termites (Isoptera, Termitidae, Macrotermitinae) in Khao Yai National Park, Thailand, ZooKeys 49 (49), pp. 77-86 : 79-80

Discoxenus katayamai Kanao & Maruyama , sp. n.

urn:lsid:zoobank.org:act:CE782948-FE3C-4809-B2F2-CA09C7196C2A

Figs 1, 2, 5C

Type series: Holotype: ♁, “ Thai: Nakhon Nayok, Khao Yai National Park, Mo Sing To (700 m alt.), 26 IX 2007, Maruyama M. and Katayama Y. leg. // Holotype Discoxenus katayamai des. Kanao & Maruyama, 2010”, abdomen dissected and mounted in Euparal ( KUM). Palatypes: 2♀, 23 sex?, same data as holotype; 8 sex?, ditto, but 28 IX 2007 ( KUM, DNP).

Symbiotic host: Odontotermes proformosanus Ahmad, 1965 .

Etymology: Dedicated to Y. Katayama, a collector of the type series.

Diagnosis. This species is similar to D. indicus through the shape of the median lobe of the aedeagus, but may be distinguished from it by the shorter body and by the number of setae on tergites III and IV, six setae on each. The smallest species of the genus.

Description. Body (Figs 1A–1B) almost uniformly orange brown, but antennae and elytra slightly darker, apical segments of antennae lighter than middle segments. Dorsal surfaces of pronotum, elytra and abdomen (Fig. 1A) smooth, glossy; elytra and abdomen (Figs 1A–1B, 2B) sparsely covered with long yellow setae. Pronotum (Figs 1A, 2A) moderately covered with macrosetae. Antennae (Figs 1A–1B) with segment I much longer than wide; segment II reduced; segment III–VII transverse; segment VIII–X subquadrate; segment XI conical, twice as long

Figure |. Habitus of Discoxenus katayamai . A dorsal view and B ventral view.

as wide, blunt at apex. Elytron ( Fig. 2B ) 2/3 as long as pronotum, with a row of 4 macrosetae, about 10 setae on lateral margin, and with 10–11 macrosetae and about 30 setae on dorsal surface. Abdominal tergite VIII ( Fig. 2C ) with 4 pairs of macrosetae along lateral margins and 14–15 pairs of setae on dorsal surface; macrochaetotaxy of abdominal tergites II–VIII: 0, 6, 6 (7), 6, 6, 6, 8; each sternite (Fig. 1B) with macrosetae on posterior marginal row. Median lobe of aedeagus elongate ( Fig. 2D ); apical lobe slightly curved paramerally; distal crest well produce. Spermatheca ( Fig. 2E ) with apical part swollen, its inner wall densely wrinkled from apex to around apical 3/5 of its length; basal part twice as long as apical part and slightly curved near apex.

Measurements. Body length: ca. 1.8–2.2; pronotal length: 0.41–0.56 (0.46±0.053); pronotal width: 0.70–0.82 (0.75±0.046); antennal length: 0.54–0.65 (0.62±0.045). N=10.

Figures

Figure 2. Discoxenus katayamai. A pronotum B elytron C abdominal tergite VIII D median lobe of aedeagus, in lateral view, and E spermatheca.