Elytrobium monilicorne ( SHARP, 1889 ) Assing, 2013

Assing, Volker, 2013, Two new genera of Lathrobiina from the East Palaearctic region (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 63 (2), pp. 219-239 : 222-224

Elytrobium monilicorne ( SHARP, 1889) , comb. n.

( Figs 1-6 , Map 1 )

Lathrobium monilicorne SHARP, 1889: 259 .

Type material examined:

Lectotype : “ Lathrobium monilicorne . Type D. S., Fuji. Japan. Lewis, an gen. nov. [handwritten on mounting label] / Sharp Coll, 1905-313 / Aedeagus at rest turned to 90° in abdomen / Lathrobium monilicorne Sharp, V.I. Gusarov det. 1992 / Lectotypus  Lathrobium monilicorne Sharp , desig. V. Assing 2013 / Elytrobium monilicorne (Sharp) , det. V. Assing 2013” ( BMNH) . Paralectotype : “ Lathrobium monilicorne . D. S., Fuji. [handwritten on mounting label] / Japan. G. Lewis. 1910-320. / Sharp Coll, 1905-313 / Lathrobium monilicorne Sharp, V. I. Gusarov det. 1992 / Paralectotypus  Lathrobium monilicorne Sharp , desig. V. Assing 2013 / Elytrobium monilicorne (Sharp) , det. V. Assing 2013” ( BMNH) .

Comment:

For details on the type material and on the lectotype designation see ASSING (in press a) .

Description:

Body length 7.0- 7.5 mm; length of forebody 3.4-3.7 mm. Habitus as in Fig. 1 . Coloration: body blackish; legs with the femora blackish-brown, the tibiae dark-brown, and the tarsi pale-brown; antennae reddish-brown with antennomere I infuscate; maxillary palpi pale-reddish.

Head ( Fig. 2 ) rather small in relation to body, approximately 1.05 times as long as broad, weakly tapering behind eyes; posterior angles rounded, but noticeable; neck approximately half the width of head; punctation coarse and dense, slightly sparser in median dorsal portion; interstices narrower than diameter of punctures, with microreticulation, and subdued shine. Eyes moderately large and composed of numerous fine ommatidia, approximately 0.6 times as long as postocular region from posterior margin of eye to neck in dorsal view. Antenna 1.7-1.8 mm long; antennomeres IV-X approximately as long as broad. Maxillary palpi with palpomere III strongly swollen, approximately twice as long as broad, and palpomere IV minute and of conical shape.

Pronotum ( Fig. 2 ) 1.13-1.14 times as long as broad and 1.19-1.24 times as broad as head, strongly convex in cross-section, broadest behind middle; lateral margins distinctly convex in dorsal view; punctation similar to that of head; interstices with shallow microreticulation; impunctate median band narrow.

Elytra ( Fig. 2 ) 1.10-1.13 times as long as pronotum; punctation dense, moderately coarse, and moderately defined; interstices narrower than diameter of punctures, without microreticulation; supramarginal line absent. Hind wings fully developed. Protarsomeres I-IV strongly dilated. Metatarsomere I approximately as long as II.

Abdomen narrower than elytra, segments III-VI of subequal width; punctation dense and distinct on anterior tergites, gradually becoming finer and sparser towards the abdominal apex; interstices with distinct microreticulation; posterior margin of tergite VII with palisade fringe.

: postero-lateral processes of tergite IX apically spineshaped; sternite VII ( Fig. 3 ) moderately transverse and with weakly concave posterior margin, pubescence unmodified; sternite VIII ( Fig. 4 ) approximately as long as broad, shallowly impressed in the middle, posterior margin weakly concave in the middle, pubescence unmodified; aedeagus ( Figs 5-6 ) 0.72 mm long, distinctly asymmetric, and without sclerotized internal structures.

Comparative notes:

Elytrobium monilicorne is the sole representative of the genus known from Japan. It is characterized by relatively large size, the conspicuously swollen maxillary palpomere III, and particularly by the shape of the aedeagus.

Distribution and natural history:

At present, the only confirmed record is from the Fujisan in Honshu, Japan ( Map 1 ). The species was doubtfully reported also from Kamchatka ( NAOMI et al. 2000) and

China (Jilin) (see PENG et al. 2012), but these records most likely refer to other species of Elytrobium and clearly require confirmation. Bionomic data are not available.

Figures

Map 1: Distribution of Elytrobium gen. n. in the southeastern East Palaearctic region: E. gongganum sp. n. (open circle); E. qinlinganum sp. n. (open triangle); E. scindens sp. n. (filled diamonds); E. seminitidum sp. n. (open diamond); E. alesianum sp. n. (filled circles); E. monilicorne (SHARP) (filled triangle).

Figs 1-13: Elytrobium monilicorne (SHARP) (lectotype) (1-6) and E. gongganum sp. n. (7-13): habitus (1, 7); forebody (2, 8); male sternite VII (3, 9); male sternite VIII (4, 10); aedeagus in lateral and in ventral view (5-6, 12-13); male sternite IX (11). Scale bars: 1-2, 7-8: 1.0 mm; 3-4, 9-10: 0.5 mm; 5-6, 11-13: 0.2 mm.