Lobrathium duplehamatum, Assing, 2010

Assing, Volker, 2010, On the Lathrobiina of Taiwan (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 301-361 : 343-345

Lobrathium duplehamatum sp. n. ( Figs 164-171 )

Type material:

Holotype ♂: " Taiwan, Nantou Hsien, Meifeng , 2130 m, 4.V.1998, A. Smetana [ T199 ] / Holotypus ♂ Lobrathium duplehamatum sp. n., det. V. Assing 2010" (cSme) . Paratypes: 1 ♂: same data as holotype (cAss) ; 1 ♂: " Taiwan, Nantou Hsien, Meifeng , 2130 m, 2.V.1998, A. Smetana [ T196 ]" (cSme); 1 ♂: " Taiwan, Nantou Hsien, Meifeng, 2130 m, 10.VII.93, A. Smetana [ T146 ]" (cSme); 1 ♂: " Taiwan, Nantou Hsien, Meifeng, 2130 m, 10.-17.VII.93, yellow pan traps, A. Smetana [ T147 ]" (cSme); 1 ♀: " Taiwan, Nantou Hsien, Meifeng, 2130 m, 12.V.1991, A. Smetana [ T78 ]" (cSme); 2 ♂ ♂: " Taiwan, Nantou Hsien, Nenkaoshan trail, 2050-2150 m, 8.V.1992, A. Smetana [ T120 ]" (cSme, cAss) .

Description:

Large species, 9.5-11.0 mm. Habitus as in Fig. 164 . Coloration as in L. stimulans .

Head approximately as broad as long or weakly oblong, posterior angles practically obsolete, broadly rounded ( Fig. 165 ); punctation similar to that in L. stimulans ; eyes of moderate size, approximately half as long as the distance from posterior margin of eye to posterior constriction of head. Antenna as in L. stimulans ( Fig. 166 ).

Pronotum approximately 1.2 times as long as broad, as wide as head or indistinctly wider ( Fig. 165 ); punctation similar to that of L. stimulans , but impunctate midline on average longer and broader.

Elytra little more than 0.7 times as long as pronotum; humeral angles marked ( Fig. 165 ); lateral parts with fine submarginal line; punctation coarse and arranged in more or less irregular, oblique, confluent rows, especially in antero-median portion; interstices without microsculpture.

Abdomen usually indistinctly broader than elytra; punctation fine and rather dense; interstices with fine microreticulation; posterior margin of tergite VII without discernible palisade fringe.

♂: posterior margin of tergite VIII weakly angled in the middle; sternites V-VI without impressions; sternite VII posteriorly with shallow oblong impression in the middle, posterior margin weakly concave; sternite VIII posteriorly with narrow impression along the middle, without pegsetae, posterior excision relatively deep and narrow ( Fig. 167 ); aedeagus with apical lobes strongly hooked ( Figs 168-169 ).

♀: tergite VIII of similar shape as in L. stimulansstimulans ( Fig. 170 ); posterior margin of sternite VIII strongly convex, in the middle weakly concave ( Fig. 171 ); tergite X of similar morphology as in L. stimulans , very slender and apically acute.

Comparative notes:

Based on the similarly derived secondary sexual characters, as well as the similar general morphology of the aedeagus, L. duplehamatum is closely allied to L. stimulans . It is distinguished from L. stimulansstimulans and L. sororium particularly by larger size, relatively smaller eyes, the somewhat serial arrangement of the elytra punctures, and by the morphology of the aedeagus.

Etymology:

The specific epithet (Latin, adj.) is composed of duple (from duplex: double) and hamatum (hooked) and refers to the shape of the apical lobes of the aedeagus.

Distribution and natural history:

The species is known from two localities in Nantou Hsien, central Taiwan, where the type specimens were found at an altitude of 2050-2150 m. They were sifted from leaf litter, bamboo, moss, humus, and other debris in a primary broadleaved evergreen forest, in a mature evergreen forest, mixed forests. One specimen was collected in a pan trap .

Figures

Figs 164-171: Lobrathium duplehamatum sp. n.: habitus (164); forebody (165); antenna (166); male sternite VIII (167); aedeagus in lateral and in ventral view (168-169); female tergite VIII (170); female sternite VIII (171). Scale bars: 164-166: 1.0 mm; 167-171: 0.5 mm.