Megacyllene Casey 1912

Megacyllene Casey, 1912 Megacyllene Casey, 1912: 348. Megacyllene (Lineicollis) Özdikmen, 2025i: 3326. Syn. nov. Remarks. Özdikmen (2025i) divided Megacyllene into two subgenera and reported: “In first group [Megacyllene (Megacyllene) Casey, 1912: 348, 351], the pronotum usually differing in being solidly and densely clothed with short pubescence, never transversally banded with light hairs except for a band only on posterior margin of pronotum; at least a post median, transverse band of light hairs always absent; antennae usually with antennomeres three to six or seven truly spinose or subspinulose externally at apex;” and “In second group, the pronotum always transversally banded with light hairs, bands usually complete or rarely interrupted on disc; at least a post median, transverse band of light hairs always present; antennomeres not spinose at apex, though sometimes very acutely angulate or subspinulose.” Martins (2011) defined Megacyllene as follows (translated): “Central area of frons elevated, or with a central elevation, always featuring a deep groove (frontal suture) on middle. Inner side of pedicel with clustered, sharp setae resembling a spine. Antennomeres III and IV subequal in length. Apical antennomeres with a projection on outer side, especially in females. Pronotum with rounded sides or notched at sides of base—when notched, the basal constriction is more pronounced than the apical one, and there is a lateral projection near the base. Elytra with a longitudinal carina. Metafemora generally with two apical spicules of equal length. Mesoventrite elevated toward mesoventral process. Prosternal process flat, posteriorly truncate and not overlapping mesoventral process.” The pubescent pattern cannot be considered a generic feature, as it represents only a specific trait. As for the “spine” on the outer apex of some antennomeres, it is highly variable in Megacyllene, with a broad range of intermediate forms between the two extremes. Consequently, it cannot be used to divide the genus into subgenera. Therefore, we are synonymizing Megacyllene (Lineicollis) with Megacyllene.