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Abstract Udeus Champion, 1902 is a weevil genus in the tribe Eugnomini associated with the inflorescences of Cecropia Loefl. (Urticaceae), with 11 valid species distributed in the Neotropics. Species of Udeus are generally rare in collections and their biology is poorly known, despite a high abundance in nature. Here, we describe Udeus cerradensis Lira, de Medeiros & Grossi, sp. nov. from the Brazilian Cerrado, including the first descriptions of larvae and pupae for a Neotropical eugnomine. We assess their role as potential pollinators of their host plant Cecropia saxatilis Snethl. and find that adults do not visit pistillate flowers and therefore are unlikely to be pollinators. This contrasts with previous reports in a different pair of species in Cecropia ‐ Udeus , suggesting that pollinator agents vary between species in this plant genus. Finally, we provide notes about the predation of larvae of U. cerradensis by social wasps Synoeca surinama (L.) and Protopolybia aff. sedula (Saussure), revealing that, in this instance, an endophytic larva does not prevent predation by a behaviourally flexible predator. This study is the first of a series on the natural history of Udeus and their specialised interactions with host plants.
Lira et al. (Wed,) studied this question.