Lathrobium biexcisum, Assing, 2013

Assing, V., 2013, On the Lathrobium fauna of Japan (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 45 (2), pp. 1615-1641 : 1621-1623

publication ID

https://doi.org/ 10.5281/zenodo.5303069

DOI

https://doi.org/10.5281/zenodo.6505293

persistent identifier

https://treatment.plazi.org/id/AD52879C-2513-FF9C-FF45-15D5FDD3FDC7

treatment provided by

Marcus

scientific name

Lathrobium biexcisum
status

sp. nov.

Lathrobium biexcisum View in CoL nov.sp. ( Figs 7-12 View Figs 7-12 )

Type material Holotype: " Gumma Pref., Nikko distr., L. Maranuma [recte: Marunuma] / 1430-1500 m., 11-12.viii.80 / JAPAN: Honsu, B.M. 1980-492, P.M. Hammond / Holotypus Lathrobium biexcisum sp.n., det. V. Assing 2013" ( BMNH).

Etymology: The specific epithet (adjective) alludes to the posterior excisions of both the male sternite VII and the male sternite VIII.

Description: Species of large size; body length 11.5 mm; length of forebody 5.1 mm. Habitus as in Fig. 7 View Figs 7-12 . Coloration: body dark-brown; legs reddish; antennae reddish.

Other external characters ( Fig. 8 View Figs 7-12 ) as in L. pollens .

: protarsomeres I-IV strongly dilated; tergite VIII with very weakly convex posterior margin; sternites III-VI unmodified; sternite VII ( Fig. 9 View Figs 7-12 ) distinctly transverse, posteriorly with pronounced median impression, this impression with moderately dense black setae; posterior margin with distinct and broad concavity in the middle, lateral margins of this concavity furnished with dense and long dark setae; sternite VIII ( Fig. 10 View Figs 7-12 ) weakly transverse, posterior excision of nearly semi-circular shape, margin of this excision and posterior median impression furnished with dense dark setae, posterior margin on either side of posterior excision acutely produced; aedeagus ( Figs 11-12 View Figs 7-12 ) 2.5 mm long and symmetric; ventral process slender, weakly curved in lateral view, subapically abruptly narrowed, and apically needle-shaped, ventrally with pair of long and pronounced carinae; dorsal plate very long, slender, lamellate, and apically acute, basal portion longer than apical portion; internal sac without sclerotized structures.

: unknown.

Comparative notes: The similar external and the similarly derived male sexual characters suggest that L. biexcisum is closely allied to L. pollens , from which it is distinguished by the less deep posterior excision of the male sternite VII and by the different shape of the slightly smaller aedeagus. The aedeagus is most similar to that of L. nasuense WATANABE 1992 , which was described from the environs of Nasu in the northeast of Tochigi Prefecture. From this species, L. biexcisum differs by the broader posterior excision of the male sternite VIII and by the different shape of the ventral process of the aedeagus in lateral view (straight basal portion shorter).

Distribution: The type locality is situated in the northeast of Gunma Prefecture, Honshu, at an altitude of 1430-1500 m.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Lathrobium

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