Brachybarcinus, Heiss, 2010

Heiss, E., 2010, Review of the Barcinus complex with description of new taxa (Hemiptera: Heteroptera: Aradidae), Zootaxa 2448, pp. 1-25 : 20-21

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new genus

Brachybarcinus new genus

Type species: Brachybarcinus vietnamensis n. sp.

Diagnosis: Micropterous. Body elongate ovate, dilated and lobulate at sides; surface with adpressed yellowish curled hairs on antennal segments I and II, legs and elevated areas and margins of the body. Colouration uniformly reddish to dark brown.

Description: Head: Distinctly longer than wide across eyes; genae short but produced over clypeus into acute spines, cleft medially; antenniferous tubercles curved with acute apex, postocular spines acute, directed laterally; antennae about 3x as long as width of head, segment I thickest and partly longest, II and IV slender and shorter, III slender, as long as I or longer. Rostrum arising from a slit-like atrium, rostral groove with carinate lateral margins, open posteriorly, rostrum not exceeding length of head.

Thorax: Pronotum: More than twice as wide as long at middle, anterior margin with a distinct collar, lateral margins lobulate; anterior lobe larger and prominent, posterior lobe smaller and dentate or reduced to a sinuate projection, disk with 2 (1+1) ovate smooth callosities surrounded by yellowish pilosity, interlobal transverse furrow developed medially, disk of anterior and posterior lobes rather flat.

Mesonotum: Scutellum: subtriangular and more than 3x as wide at base as long, anterior margin with a median projection overlapping the pronotum; lateral margins sinuate and carinate, disk with a median stripe of pilosity which is anteriorly enlarging to width of anterior projection, transversely rugose laterally.

Hemelytra reduced to ovate wingpads with short corium, reaching ½ of scutellum, lateral and posterior margins sinuate, sometimes a small vestige of membrane may be developed.

Metanotum: Consisting of 2 (1+1) large ovate plates connected behind the apex of scutellum and there fused to tergites I+II, surface, this smooth with a median posteriorly inclined furrow indicating the fusion line between mesonotum and tergite I; a distinct suture separating the narrow transverse tergite II which bears an ovate depression at middle.

Abdomen: Lateral margins rounded, pe-angles of deltg’s partly produced, deltg II and III not fused; tergal plate of fused mediotergites III–VI flat, posterior margins of mtg II–V marked by sinuate furrows, dorsal scent gland opening of mtg III displaced posteriorly and slightly elevated; anterior apodemal impressions of midlateral area delimited anterolaterally by a semicircular black carina; posterior margin straight.

Venter: Spiracles III–VII ventral far from lateral margin, VIII lateral and visible from above; metathoracic scent gland canals straight with carinate margins.

Legs: Long and slender, tarsi bisegmented, claws with thin pseudopulvilli.

Etymology: From> brachy> (greek) short (winged) and Barcinus , characterising the conspicuous abdominal structure.

Discussion: Brachybarcinus n. gen. resembles Heterobarcinus n. gen.: however, it differs and can be easily distinguished from the latter by the micropterous alary condition of all species, the structure of thoracal sclerites and the exposed tergal plate. Distribution see map 1.