Tetrabothrus sulawesicus, Assing, 2016

Assing, Volker, 2016, On some Lomechusini of the Palaearctic and Oriental regions (Coleoptera: Staphylinidae: Aleocharinae), Beiträge Zur Entomologie = Contributions to Entomology 66 (1), pp. 13-111 : 102-103

publication ID

https://doi.org/ 10.21248/contrib.entomol.66.1.13-111



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scientific name

Tetrabothrus sulawesicus

sp. nov.

Tetrabothrus sulawesicus View in CoL spec. nov.

( Figs 167–169 View Figs 160–180 , 342–454 View Figs 340–358 View Figs 359–378 View Figs 379–395 View Figs 396–419 View Figs 420–441 View Figs 442–458 )

Type material: Holotype ♂: “ Indonesia: Sulawesi-Utara , Dumoga-Bone N.P ., November 1985 / Plot A, ca 200 m, Lowland forest / Flight interception trap / R. Ent. Soc. Lond., Project Wallace, B.M. 1985-17 / Holotypus ♂ Tetrabothrus sulawesicus sp. n., det. V. Assing 2016 ” ( BMNH).

Paratypes: 1 ♀: same data as holotype (cAss) ; 1 ♂: same data, but “ October 1985 ” ( BMNH) ; 1 ♀: same data, but “ 24 Februar 1985 ” ( BMNH) ; 1 ♂, 1 ♀: same data, but “ April 1985 / Plot B, ca 300 m ” ( BMNH, cAss) .

Comment: The specific epithet (adjective) is derived from Sulawesi, the Indonesian island where the species was discovered.

Description: Body length 4.5–6.0 mm; length of forebody 1.9–2.5 mm. Coloration: head and pronotum variable, bright-reddish to blackish-brown; elytra blackish-brown; abdomen variable, reddish to black; legs bicoloured: femora pale yellowish with the apices – especially those of the metafemora rather broadly – brown to blackishbrown, tibiae and tarsi brown; antennae black with antennomeres I–III and at least the apex of XI reddish; maxillary palpi yellowish.

Head ( Fig. 167 View Figs 160–180 ) strongly transverse, 1.25–1.30 times as broad as long; posterior angles obsolete; punctation extremely fine and moderately dense, except along the impunctate middle of the dorsal surface; pubescence long and pale. Eyes large, approximately as long as distance from posterior margin of eye to posterior constriction of head. Antenna ( Fig. 168 View Figs 160–180 ) 1.2–1.3 mm long.

Pronotum ( Fig. 167 View Figs 160–180 ) weakly transverse, 1.06–1.15 times as broad as long and 1.02–1.08 times as broad as head, strongly convex in cross-section; punctation fine and moderately dense; pubescence pale, long, and suberect.

Elytra ( Fig. 167 View Figs 160–180 ) 0.85–0.90 times as long as pronotum; punctation denser and less fine than that of pronotum; pubescence very long and suberect. Hind wings fully developed. Metatarsomere as long as the combined length of metatarsomeres II and III.

Abdomen ( Fig. 169 View Figs 160–180 ) narrower than elytra and with moderately deep anterior impressions on tergites III– VI; tergites III–VII each with four setiferous punctures at posterior margins; tergite VII without non-setiferous punctation, posterior margin with palisade fringe; tergite VIII with dense fine setiferous punctures near anterior margin, otherwise impunctate.

♂: posterior margin of sternite VIII strongly produced, convexly pointed in the middle ( Fig. 454 View Figs 442–458 ); median lobe of aedeagus ( Figs 452–453 View Figs 442–458 ) 0.53–0.58 mm long; ventral process subapically weakly curved in lateral view and rather narrow in ventral view; paramere nearly 0.6 mm long, its apical lobe of moderate length and slender.

Comparative notes: Tetrabothrus sulawesicus is reliably distinguished from other congeners with bicoloured legs and without non-setiferous punctation on tergite VII (and VIII) only by the shape of the median lobe of the aedeagus, from most species also by the more strongly pointed posterior margin of the male sternite VIII. It additionally differs from T. clavatus , the only other representative of the genus recorded from Sulawesi, by smaller and less bulging eyes, bicoloured legs, and darker antennomeres IV–IX.

Distribution and natural history: The type locality, today Bogani Nani Wartabone National Park, is situated on Minahassa Peninsula in the north of Sulawesi, Indonesia. The specimens were collected with flight interception traps in lowland forests at altitudes of 200 and 300 m.


United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]

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