Hemicladus Buquet, 1857

Tavakilian, Gérard Luc, Touroult, Julien & Dalens, Pierre-Henri, 2010, Revision of the genus Hemicladus Buquet, 1857 with a special focus on the species from French Guiana (Coleoptera: Cerambycidae: Lamiinae), Zootaxa 2358, pp. 39-48 : 40

Genus Hemicladus Buquet, 1857

Hemicladus Buquet, 1857: 328 ; Thomson, 1860: 43, 73; Thomson, 1864: 124, 401 (type species designation); Lacordaire, 1872: 906; Gemminger & Harold, 1873: 3214 (Catalogue); Aurivillius, 1923: 599 (Catalogue); Fuchs, 1955: 53 (Key); Galileo & Martins, 1991: 249 (Key); Monné, 1995: 81 (Catalogue); Monné, 2005: 330 (Catalogue). Type species: Hemicladus dejeanii Buquet, 1857 , by the designation of Thomson, 1864: 124.

Diagnosis. Length 8-18 mm. Claw divaricated. Pronotum broader than long, with a small, more or less spiny tubercle on the middle of each lateral margin. Mesosternum with one or two tubercles. Antennae elevensegmented, of about the same length as the body of the male and the female (from apex of mandibles to apex of elytra). Scape with a notch at the apical external margin. Antennomere 3 is the longest segment (equal to the length of the scape in some species) and is slightly indented at the apex; antennomere 4 is more noticeably indented and is flattened; antennomeres 5 to 7 are completely flattened and project at the apex; antennomere 8 is variable; the last three antennomeres are cylindrical and of nearly equal length. Scutellum small. Elytra elongated, convex and rounded at the apex.

Hemicladus Buquet is closely related to the genus Eumimesis Bates : both share the flattened antennomeres that are projected at the apex. In Eumimesis , only antennomere 5, sometimes 5 and 6, are expanded, whereas in Hemicladus antennomeres 4 to 7 are expanded. The distinction between the two genera is narrow and the species Hemicladus fasciatus Galileo & Martins, 1991 shows intermediate antennal features. In a broader revision of the Calliini , which is beyond the scope of this article, a more inclusive generic concept may be considered.