Granimedon anguliceps, Assing, 2015

Assing, Volker, 2015, Two new genera of Medonina from China and Japan (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 47 (1), pp. 191-206 : 194-196

Granimedon anguliceps nov.sp. ( Figs 1-12 , Map 1 )

T y p e m a t e r i a l: Holotype 3: " CHINA [16] - Yunnan, valley S Gejiu, field margin, 23°08'53''N, 103°10'58''E, 1250 m, 21.VIII.2014, V. Assing / Holotypus 3 Granimedon anguliceps sp.n. det. V. Assing 2015 " (cAss) . Paratypes: 2033, 22♀♀ [partly teneral]: same data as holotype (cAss, MNHUB) ; 2♀♀, 1 ex. [teneral]: " CHINA: Yunnan, valley S Gejiu, 23°08'38''N, 103°11'42''E, 1010 m, road margin, litter and soil sifted, 21.VIII.2014, leg. M. Schülke [CH14-15]" (cSch, cAss) .

E t y m o l o g y: The specific epithet (Latin, noun in apposition) alludes to the marked posterior angles of the head.

D e s c r i p t i o n: Body length 4.5-5.3 mm; length of forebody 2.5-2.8 mm. Habitus as in Fig. 1 . Coloration: body dark-brown to blackish-brown; legs dark-yellowish; antenna reddish, with antennomere I somewhat darker.

Head ( Fig. 2 ) transverse, approximately 1.2 times as broad as long, with distinctly marked posterior angles, posteriorly weakly concave; dorsal surface practically matt, with rather coarse, very dense, and umbilicate punctation ( Fig. 4 ); interstices reduced to narrow ridges. Eyes large and bulging, distinctly longer than postocular region in dorsal view ( Fig. 2 ). Antenna approximately 1.3 mm long.

Pronotum ( Fig. 2 ) strongly transverse, 1.25-1.28 times as broad as long and slightly broader than head, widest anteriorly; posterior angles very indistinct, broadly rounded, practically obsolete; punctation very dense and granulose ( Fig. 8 ); dorsal surface matt; midline with very narrow impunctate line of often reduced length.

Elytra 1.15-1.20 times as long as pronotum; punctation dense and moderately fine. Hind wings fully developed. Protarsomeres I-IV not dilated. Metatarsomere I longer than II, but slightly shorter than the combined length of II and III.

Abdomen narrower than elytra; punctation rather dense and very fine; interstices with shallow microsculpture; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII distinctly convex.

3: sternite VII ( Fig. 9 ) with truncate posterior margin and with unmodified pubescence; sternite VIII ( Fig. 10 ) oblong and with strongly convex posterior margin; aedeagus approximately 0.53 mm long and shaped as in Figs 11-12.

C o m p a r a t i v e n o t e s: Granimedon anguliceps is distinguished from other species of the genus by the more sharply marked posterior angles of the head, the more transverse pronotum, and by the morphology of the aedeagus.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: Thespecieswasdiscoveredin two localities to the south of Gejiu, southeastern Yunnan, Southwest China ( Map 1 ). The specimens were sifted from litter, dry grass, and other debris at a field margin and at a road margin at altitudes of 1010 and 1250 m. Most of the paratypes are more or less distinctly teneral.

Figures

Map 1: Distribution of Granimedon: Granimedon creber (open circle); G. effeminatus (filled diamond); G. anguliceps (open triangles).

Figs 1-8: Granimedon anguliceps nov.sp.: (1) habitus; (2) head and pronotum in dorsal view; (3) head and prothorax in ventral view; (4) median portion of head; (5) maxilla; (6) labium; (7) ligula; (8) median portion of pronotum. Scale bars: 1-3: 1.0 mm; 4-8: 0.1 mm.

Figs 9-12: Granimedon anguliceps nov.sp.: (9) male sternite VII; (10) male sternite VIII; (11) aedeagus in lateral view; (12) apical portion of aedeagus in ventral view. Scale bars: 9-10: 0.5 mm; 11-12; 0.2 mm.