Bryothinusa gangjinensis, Ahn, Kee- Jeong & Jeon, Mi- Jeong, 2004

Ahn, Kee- Jeong & Jeon, Mi- Jeong, 2004, The Korean Species Of The Genus Bryothinusa Casey With Descriptions Of Two New Species (Coleoptera: Staphylinidae: Aleocharinae), The Coleopterists Bulletin 58 (1), pp. 29-35 : 29-31

Bryothinusa gangjinensis , new species

Figs. 1–6

Description. Small, body length 2.4 mm. Body shape more or less parallel-sided. Head, pronotum and abdomen black; elytra dark brown; legs, antennae, and mouthparts brown. Head. Slightly deflexed, about 0.8 times longer than wide. Eyes very large, setae present between about 34 facets, longer than tempora. Neck absent. Microsetae more or less uniformly distributed. Antenna with 11 antennomeres; antennomeres 1–4, 11 longer than wide; 5–7 almost quadrate, 8– 10 very slightly wider than long. Infraorbital carina absent. Mouthparts. Labrum ( Fig. 1 ) broadly and evenly rounded in apical outline, 8 þ 8 major setae distinct, lateral setae short. Mandibles ( Fig. 2 ) elongate, asymmetrical, right with median tooth, on left tooth absent, apex blunt. Maxilla with galea and lacinia elongate, galea narrower and shorter than lacinia; galea corneous, filiform setae present on tip, absent on mesal surface; lacinia ( Fig. 3 ) with 2 indistinct and 5 distinct spines interdigitating with spinose scales, a pair of hook-like setae present near base of lacinia; maxillary palpus with 4 articles, elongate, cardo very elongate. Labial palpi with 2 articles and indistinct article at tip oriented mesally, extremely elongate, most setae distributed basally; twin pores present; two minute setae present on ligula; two medial setae present side by side, setal pore and real pores present, median pseudopores absent in narrow median area, pseudopores absent on each side; a pair of comb-like hypoglossae present. Mentum with antero-lateral angles prolonged into spinose processes, anterior margin deeply truncate, two long medial setae present. Thorax. Pronotum ( Fig. 4 ) 1.1 times wider than long, narrowest at base and widest near apical fourth, basal margin slightly rounded, apical margin slightly prolonged anteriorly; 3 macrosetae present on apical margin, 3 on apical third, and 2 at basal margin on each side; microsetae uniformly distributed; pubescence at midline directed anteriorly, at lateral margin directed laterally. Hypomera entirely visible in lateral aspect. Mesocoxal cavities contiguous, not margined posteriorly; mesosternal process sharply pointed, reaching almost 2/3 of coxal cavities. Legs. Tarsal formula 4-4-5; one empodial seta present. Elytra. 1.2 times longer than pronotum; microsetae numerous, directed posteriorly, uniformly distributed; about 10 macrosetae evenly distributed; postero-lateral margin slightly sinuate. Hind wings present. Metasternum with 2 pairs of macrosetae, round sclerite present internally. Abdomen. Sides uniformly converging to rounded apex; apical margins of tergites III–V broadly V-shaped. Tergites III–V impressed at base. Sternites not constricted at base. Tergite VII with small gland opening. Tergite VIII with posterior margin sinuate. Aedeagus. Median lobe as in Figure 6 . Spermatheca as in Figure 5 .

Type Series. Holotype, labeled as follows: Korea: Jeonnam Prov., Gangjin-Gun, Maryang-Myeon, Gugok , 19 VII 2000, K.-J. Ahn, S.-J. Park, M.-J. Jeon, under stones in the mud flat ; Holotype, Bryothinusa gangjinensis Ahn, Desig. K. - J. Ahn 2002. deposited in the Chungnam National University Insect Collection, Korea . Paratypes, 26; same data as type.

Distribution. Korea (only known from type locality).

Comments. Bryothinusa gangjinensis can be distinguished from other Korean species by combination of: body black, mandibles elongate with blunt tip, compound eyes very large, hind wings present, metasternum large with two pairs of macrosetae, and round sclerite inside.

Figures

Figs. 1–6. Bryothinusa gangjinesis. 1) Labrum, dorsal aspect; 2) mandible, dorsal aspect; 3) lacinia, dorsal aspect; 4) spermatheca, dorsal aspect; 5) pronotum, dorsal aspect; 6) median lobe, dorsal aspect. Scale bars ¼ 0.1 mm.