Coimedon dissimilis ( SHARP , 1874) 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: 204-205

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Coimedon dissimilis ( SHARP , 1874)


Coimedon dissimilis ( SHARP, 1874)   , nov.comb. ( Figs 30-42 View Figs 30-38 View Figs 39-42 )

Lithocharis dissimilis SHARP, 1874: 66   f.

T y p e m a t e r i a l e x a m i n e d: Holotype 3: " Japan. G. Lewis. 1910-320 / Lithocharis dissimilis   . type D.S. / Type H.T. / Holotypus 3 Lithocharis dissimilis Sharp   , rev. V. Assing 2015 / Coimedon dissimilis (Sharp)   , det. V. Assing 2015 " (BMNH).

C o m m e n t: The original description is based on "One female specimen, found in a rubbish heap at Nagasaki " ( SHARP 1874). An examination of the holotype revealed that it is a male and that it does not belong to Lithocharis   .

R e d e s c r i p t i o n: Body length 4.2 mm; length of forebody 2.2 mm. Head, pronotum, and abdomen black; elytra bicoloured, blackish, with the posterior margin broadly yellowish; legs with the femora dark-brown, the tibiae yellowish-brown, and the tarsi yellowish; antennae reddish.

Head ( Fig. 31 View Figs 30-38 ) large in relation to body ( Fig. 30 View Figs 30-38 ) and distinctly transverse, approximately 1.3 times as broad as long, broadest across eyes, with distinctly marked posterior angles, and posteriorly weakly concave; dorsal surface with dense, rather coarse, and granulosely umbilicate punctation ( Fig. 33 View Figs 30-38 ); interstices narrow, but noticeable, and without microsculpture. Ventral aspect of head as in Fig. 32 View Figs 30-38 . Eyes large and bulging, much longer than postocular region in dorsal view ( Fig. 31 View Figs 30-38 ). Antenna 1.05 mm long and shaped as in Fig. 34 View Figs 30-38 .

Pronotum ( Fig. 31 View Figs 30-38 ) strongly transverse, 1.35 times as broad as long and 0.95 times as broad as head, widest at anterior angles; anterior angles sharply marked, posterior angles very indistinct, broadly rounded; lateral margins weakly concave in dorsal view, with two long and stout black setae, one of them at anterior angles and the other a short distance behind anterior angles, these setae inserting in denticle-shaped lateral projections; punctation dense and coarsely granulose ( Fig. 36 View Figs 30-38 ); interstices narrow, but noticeable, and without microsculpture; midline without impunctate band.

Elytra ( Fig. 30 View Figs 30-38 ) approximately 1.3 times as long as pronotum; punctation dense and moderately fine. Hind wings fully developed. All tarsi slender with oblong tarsomeres. Metatarsomere I longer than II, but shorter than the combined length of II and III.

Abdomen narrower than elytra; tergites III-VI and sternites III-VI with distinct anterior impressions; punctation denser and moderately coarse on anterior, sparser and finer on posterior tergites; microsculpture very shallow and composed of scale-shaped meshes; posterior margin of tergite VII with palisade fringe; tergite VIII distinctly oblong and with weakly convex posterior margin.

3: sternite VII with truncate posterior margin and with unmodified pubescence; sternite VIII ( Fig. 42 View Figs 39-42 ) oblong, longer than tergite VIII, and with weakly convex posterior margin, without posterior excision; aedeagus ( Figs 37-38 View Figs 30-38 ) 0.7 mm long, weakly sclerotized, with apically acute ventral process; internal sac with two long series of dark spines and membranous structures.

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: The type locality is situated in Kyushu, South Japan. According to the original description, the holotype was collected from a "rubbish heap".














Coimedon dissimilis ( SHARP , 1874)

Assing, Volker 2015

Lithocharis dissimilis SHARP, 1874: 66

SHARP D 1874: 66