Lobrathium stimulans, Assing, 2010

Assing, Volker, 2010, On the Lathrobiina of Taiwan (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 301-361 : 340-342

Lobrathium (subgenus?) stimulans sp. n. ( Figs 145-154 )

Type material:

Holotype ♂: " Taiwan, Kaohsiung Hsien, Peinantashan trail, 2390-2490 m, 5.VII.1993, A. Smetana [ T138 ] / Holotypus ♂ Lobrathium stimulansstimulans sp. n., det. V. Assing 2010" (cSme) . Paratypes: 7 ♂ ♂, 6 ♀ ♀: same data as holotype (cSme, cAss) ; 4 ♂ ♂, 1 ♀: " Taiwan, Kaohsiung Hsien, Peinantashan trail, 2080 m, 6.VII.93, A. Smetana [ T141 ]" (cSme, cAss) ; 4 ♂ ♂, 4 ♀ ♀: " Taiwan, Kaohsiung Hsien, Peinantashan trail, 2500 m, 4.VII.93, A. Smetana [ T136 ]" (cSme, cAss); 1 ♂, 1 ♀: " Taiwan, Kaohsiung Hsien , Peinantashan trail, 2250 m, 4.VII.93, A. Smetana [ T137 ]" (cSme, cAss); 1 ♂: " Taiwan, Kaohsiung Hsien , Peinantashan trail, 2065 m, 6.VII.93, A. Smetana [ T140 ]" (cAss); 4 ♀ ♀: " Taiwan, Kaohsiung Hsien , Peinantashan trail, 2500 m, 4.V.1995, A. Smetana [ T171 ]" (cSme); 1 ♀: " Taiwan, Kaohsiung Hsien, Peinantashan trail, 2080 m, 2.V.1995, A. Smetana [ T169 ]" (cSme) .

Description:

Body length 8.0-10.0 mm. Habitus as in Fig. 145 . Coloration: body blackish-brown; legs and antennae reddish-brown to dark-brown.

Head as long as wide or indistinctly oblong, lateral margins behind eyes subparallel or weakly diverging ( Fig. 146 ); punctation well-defined, very dense (interstices narrower than punctures), and not very coarse; median dorsal portion with sparse punctation; interstices without microsculpture; eyes of moderate size, approximately half as long as the distance from posterior margin of eye to posterior constriction of head in dorsal view, or slightly larger. Antennae moderately slender; antennomere III slightly longer than II; IV-IX approximately 1.5 times as long as wide ( Fig. 147 ).

Pronotum approximately 1.2 times as long as wide and slightly broader than head ( Fig. 146 ); punctation slightly coarser and somewhat less dense than that of head; midline more or less narrowly impunctate, at least in posterior 1/2-3/4; interstices without microsculpture.

Elytra short, approximately 0.7 times as long as pronotum, humeral angles moderately marked ( Fig. 146 ); punctation dense, irregular (not arranged in rows) and coarse, but often partly weakly defined, rugose and/or confluent; lateral parts with fine submarginal line. Hind wings reduced.

Abdomen slightly broader than elytra; punctation fine and dense; interstices with shallow microreticulation; posterior margin of tergite VII with or without very narrow rudiment of a palisade fringe.

♂: posterior margin of tergite VIII weakly angled in the middle ( Fig. 154 ); sternites V and VI with indistinct median impression; sternite VII with distinct narrow impression along middle, posterior margin weakly concave and with row of long black submarginal setae ( Fig. 148 ); sternite VIII with distinct impression along middle, without peg-setae; posterior excision relatively deep and narrow ( Fig. 149 ); aedeagus as in Figs 150-151 .

♀: posterior margin of tergite VIII in the middle with acute projection ( Fig. 152 ); posterior margin of sternite VIII distinctly produced in the middle ( Fig. 153 ); lateral sclerites of tergite IX broadly separated anteriorly, tergite X anteriorly truncate and reaching anterior margin of tergite IX, very slender, and apically acute.

Comparative notes:

From L. taiwanense , the only previously described endemic Lobrathium species from Taiwan, the new species is distinguished particularly by the darker coloration, by the presence of impressions on the male sternites V-VIII, and by the completely different shape of the aedeagus. For illustrations of L. taiwanensetaiwanense see WATANABE (1998).

Etymology:

The specific epithet (Latin; present participle of stimulare) refers to the acutely produced posterior margins of the female tergites VIII and IX.

Distribution and natural history:

The known distribution is confined to several localities in the Peinantashan , Kaohsiung Hsien, southern Taiwan. The type specimens were sifted from wet leaf litter, moss, and other debris, partly around tree bases, in a secondary broadleaved forest, beneath broadleaved bushes, along forest roads, and at base of small waterfall at altitudes of 2065-2500 m .

Figures

Figs 145-153: Lobrathium stimulans sp. n.: habitus (145); forebody (146); antenna (147); male sternite VII (148); male sternite VIII (149); aedeagus in lateral and in ventral view (150-151); female tergite VIII (152); female sternite VIII (153). Scale bars: 145-147: 1.0 mm; 148-153: 0.5 mm.

Figs 154-163: Lobrathium stimulans sp. n. (154) and L. sororium sp. n. (155-163): male tergite VIII (154); habitus (155); forebody (156); male sternite VII (157); male sternite VIII (158); aedeagus in lateral and in ventral view (159-160); female tergite VIII (161); female sternite VIII (162); apices of female tergites IX and X (163). Scale bars: 155-156: 1.0 mm; 154, 157-163: 0.5 mm.