Comparative morphology of the genera of the group Merobruchus (Coleoptera: Chrysomelidae: Bruchinae): diagnoses and key

A comparative analysis was carried out based on the detailed morphology of adults of seven genera: Caryedes Hummel, 1827, Ctenocolum Kingsolver & Whitehead, 1974, Gibbobruchus Pic, 1913, Meibomeus Bridwell, 1946, Merobruchus Bridwell, 1946, Penthobruchus Kingsolver, 1973, and Pygiopachymerus Pic, 1911, joined in the Merobruchus group. This group is included in Acanthoscelidina Bridwell, the largest subtribe of Bruchinae, and with imprecise limits. This study describes new characters, suggests a new hypothesis for the relationships among the genera, proposes diagnoses of the group and its genera, and provides a dichotomous key. It was also possible to record Caryedes godmani (Sharp, 1885) and Caryedes longifrons (Sharp, 1885) for the first time from Brazil and Dioclea virgata (Rich.) Amshoff (Papilionoideae) as a new host plant for C. godmani.

Caryedes; Ctenocolum; Gibbobruchus; Meibomeus; Merobruchus; Penthobruchus; Pygiopachymerus; taxonomy