Acangassuini

Nascimento, Francisco E. De L. & Bravo, Freddy, 2018, Review of Acangassuini Galileo & Martins, 2001 (Insecta, Coleoptera, Cerambycidae), with description of a new genus and species, and description of two new species in the tribes Methiini Thomson, 1860 and Oemini Lacordaire, 1868, Zootaxa 4379 (4), pp. 576-584 : 577

Acangassuini Galileo & Martins, 2001

Type-genus: Acangassu Galileo and Martins, 2001 .

Notes based on study of photographs of holotype of type genus.

Head enlarged anteriorly, remarkably wider than prothorax. Eyes emarginate, coarsely faceted, prominent, occupying entire anterior side until ventral area; upper eye lobes with five rows of ommatidia. Maxillary palpus longer than labial palpus; apical palpomeres fusiform. Antennae 12-segmented, scape cylindrical, slightly curved and widened toward apex. Antennomeres not carinate; III slightly shorter than IV. Prothorax cylindrical, parallelsided, with thin, short lateral spine, located just before middle; prosternal process very narrow. Procoxal cavity closed behind; mesocoxal cavity closed laterally. Elytral apex unarmed. Femora sublinear, unarmed at apex. Tibiae without carina. Abdominal ventrite I as long as II.

Remarks. Galileo & Martins (2001) compared Acangassuini to Ibidionini Thomson, 1861 (currently, Neoibidionini Monné, 2012 ) and Obriini Mulsant, 1839 . Obriini can be easily differentiated from Acangassuini by the laterally rounded prothorax; abdominal ventrite I, in males, longer than II + III; and by the pedunculate-clavate femora. In Acangassuini the prothorax is parallel-sided, abdominal ventrites of males have subequal length and the femora are sublinear. The authors mentioned that Acangassuini is more similar to Neoibidionini due to the slender body shape. Acangassuini differs from Neoibidionini by the prothorax with lateral spine and anterior region of the head remarkably wider than the diameter of the prothorax. Neoibidionini lacks a spine at the sides of prothorax and the head is slightly wider than the prothorax diameter.

In the original description of the tribe, Galileo & Martins (2001) mentioned that in Acangassu Galileo & Martins, 2001 , antennomere III is shorter than IV, a character also found in Acangarana gen. nov.; accordingly, we considered it as a tribal feature.