Ypomacena, Martins, Ubirajara R., Galileo, Maria Helena M. & Santos-Silva, Antonio, 2016

Martins, Ubirajara R., Galileo, Maria Helena M. & Santos-Silva, Antonio, 2016, Five new species, one new genus, two synonymies, and new distributional records in Cerambycidae (Coleoptera), Zootaxa 4078 (1), pp. 320-333 : 324

Ypomacena gen. nov.

Type species: Ypomacena monnei sp. nov. by original designation

Description. Body elliptical, dorsally convex. Frons wider than long. Distinct coronal suture distinctly from clypeus to anterior edge of prothorax. Clypeus large, about two times wider than long; edge close to frons semicircular. Eyes small, narrow, C-shaped; superior ocular lobes very far apart from each other; inferior ocular lobes about three times shorter than gena. Antennal tubercles very far apart from each other. Antennae short, at most reaching base of distal third of elytra; scape very slender, gradually enlarged towards apex; antennomeres III and IV distinctly longer than other antennomeres.

Prothorax transverse, slightly wider at base than apex; sides rounded, without distinct tubercle. Pronotum without distinct tubercles. Prosternum hidden by head. Prosternal process wide. Mesosternal process obliquely elevate at base, emarginate at apex. Metasternum short, about as long as mesosternum. Elytra distinctly wider than prothorax at base, basal fourth with strong gibbosity; each elytron with, at least, three distinct, elevate carinae. Femora clavate.

Etymology. Anagram of Apomecyna , type genus of Apomecynini . Feminine gender.

Remarks. Ypomacena gen. nov. differs from nearly all American genera of Apomecynini by the elliptical body shape, and resembling some genera of Acanthoderini Thomson, 1860 , Acanthocinini Blanchard, 1845 , and Parmenini Mulsant, 1839 . Usually, in the American Apomecynini the body is elongate, except in Phrynidius Lacordaire, 1869 , and Potiatuca Galileo & Martins, 2006 , that have the body shape more similar to Ypomacena gen. nov. This genus differs from the former by the transverse prothorax, by the antennal tubercles very far apart from each other, and by the slender scape. In Phrynidius the prothorax is longitudinal, the antennal tubercles are near each other, and the scape is thicker. From Potiatuca it differs by the distinctly slender scape (distinctly thicker in Phrynidius ), and by the prothorax which is less distinctly narrowed at base and apex (distinctly so in Phrynidius ).

Ypomacena gen. nov. can be included in the alternative of couplet “11”, from Breuning (1971) (translated):

11. Metasternum shortened............................................................................... 12 - Metasternum of normal length.......................................................................... 13 12(11). Antennal tubercles distinctly protruding.............................................. Phrynidius Lacordaire, 1869 - Antennal tubercles not distinctly protruding.............................................................. 12’ 12’(12). Body elongate; elytra without gibbosities............................................ Parmenonta Thomson, 1868 - Body elliptical; elytra with distinct gibbosities.............................................. Ypomacena gen. nov.