ABSTRACT. Baetidae (Insecta, Ephemeroptera) from Roraima, Brazil: new records and a key to genera and species at nymphal stage. Roraima is one of the Brazilian states where least is known regarding the family Baetidae; to date only four species have been recorded from the state.
In the present study the imagos of Harpagobaetis Mol and Tomedontus Lugo-Ortiz & McCafferty are described for the first time. They can be differentiated from other genera of Baetidae by the following combination of characteristics: Harpagobaetis, forewing with paired marginal intercalary veins; hind wing present with two complete longitudinal veins; costal projection of hind wing pointed, placed in the basal third of anterior margin, cross veins absent; forceps three-segmented, segment I with bulbous base, segment III long, about 3 × as long as wide; Tomedontus, dorsal portion of turbinate eye circular; forewing with paired marginal intercalary veins; hind wing absent; forceps three-segmented, segment II with strong medial projection; subgenital plate without projection.
One new taxon was brought to light during an Ephemeroptera survey in Roraima state, but it was not described. This new taxon was included in a cladistics analysis (as Gen A) in order to delimitate some Baetidae genera, and it was recovered as a new genus. Taking in account that the new genus and species status were already defined in a previously published paper, the objective of this study was to describe it based on imagoes and nymphs, and formally name it as Macuxi tunamore gen. nov. sp. nov. The new genus is sister group of Rhopyscelis Cruz, Salles & Hamada + Varipes Lugo-Ortiz & McCafferty clade, and can be differentiated from both mainly by the absence of long and stout setae on femora of all legs. Several characteristics were obtained in the morphological analyses to distinguish the new genus from other genera, but the paraglossa and glossa with pectinate setae, and claw with two rows of denticles, one reduced and other with apical ones larger than the others, are highlighted.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.