Lathrobium inflatum, Assing, 2013

Assing, V., 2013, On the Lathrobium fauna of Japan (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 45 (1), pp. 1615-1641 : 1632

publication ID

https://doi.org/ 10.5281/zenodo.13146694

persistent identifier

https://treatment.plazi.org/id/03E28784-2F2C-CD65-5AE6-C9E2FE93FA40

treatment provided by

Felipe

scientific name

Lathrobium inflatum
status

sp. nov.

Lathrobium inflatum View in CoL nov.sp. ( Figs 36-43 View Figs 36-43 )

T y p e m a t e r i a l: Holotype 3: "Gumma Pref., Mt. Hotaka (foot), ca 1300 m, 14-15.viii.80 / JAPAN: Honshu, B.M. 1980-492, P.M. Hammond / Holotypus 3 Lathrobium inflatum sp.n., det. V. Assing 2013" ( BMNH).

E t y m o l o g y: The specific epithet is the past participle of the Latin verb inflare (to inflate) and alludes to the large basal portion of the internal structure of the aedeagus.

D e s c r i p t i o n: Small species; body length 6.0 mm; length of forebody 2.5 mm. Habitus as in Fig. 36 View Figs 36-43 . Coloration: body reddish-brown with the abdominal segments V- VII somewhat darker; legs pale yellowish-brown; antennae reddish.

Head ( Fig. 37 View Figs 36-43 ) approximately as long as broad; punctation moderately coarse and rather sparse, interstices distinctly broader than diameter of punctures, with shallow microreticulation. Eyes small, weakly convex, and composed of approximately 25 ommatidia, approximately one fourth as long as postocular region in dorsal view. Antenna 1.5 mm long.

Pronotum ( Fig. 37 View Figs 36-43 ) 1.25 mm long and approximately as broad as head; punctation similar to that of head, but distinctly denser; impunctate midline moderately broad.

Elytra ( Fig. 37 View Figs 36-43 ) moderately short, 0.65 times as long as pronotum; punctation fine and shallow. Hind wings completely reduced.

Abdomen slender, but distinctly broader than elytra; punctation very fine and very dense; interstices with distinct microreticulation; posterior margin of tergite VII without palisade fringe.

3: protarsomeres I-IV strongly dilated; tergite VIII with weakly convex posterior margin; sternites III-VI unmodified; sternite VII ( Fig. 38 View Figs 36-43 ) strongly transverse and with shallow postero-median impression, posterior margin weakly concave, pubescence unmodified; sternite VIII ( Fig. 39 View Figs 36-43 ) weakly oblong, pubescence unmodified, posterior excision Vshaped and moderately deep; aedeagus ( Figs 40-43 View Figs 36-43 ) 1.0 mm long; ventral process symmetric, slender and subapically weakly curved in lateral view, and apically acute; dorsal plate with long, stout, strongly sclerotized, and apically acute apical portion and with long, slender, lamellate, and weakly sclerotized basal portion; internal sac with two sclerotized structures, one of them moderately long, slender, apically acute, and basally bifid and the other basally very large, apically extending into a long, slender, strongly curved, asymmetric spine.

♀: unknown.

C o m p a r a t i v e n o t e s: Based on the similar external characters, the shape and chaetotaxy of the male sternite VII and VIII, and particularly on the similarly derived morphology of the aedeagus (internal sac with a basally strongly inflated sclerotized structure), L. inflatum undoubtedly belongs to the L. sinense group. In external characters, it is practically indistinguishable from the similar L. nikkoense , but differs by the completely different shapes of the internal structures of the aedeagus.

D i s t r i b u t i o n: The type locality is situated at the foot of Hotaka-san (36°48'N, 139°08'E] in the north of Gunma Prefecture, Honshu, at an altitude of approximately 1300 m.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Lathrobium

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