The identities and the relationships of Odonteucoila Ashmead, 1903, Coneucoela Kieffer, 1909, and Trichoplasta Benoit, 1956, are discussed and the re-defined genera are described. The use of some morphological terms are defined and other new terms are proposed. Lectotypes are designated for Odonteucoila chapadae and Coneucoela brasiliensis (type- species of the respective genera); four new synonymies and fourteen new combinations are proposed. Odonteucoila auct. is considered polyphyletic. The re-defined genus Odonteu- coila is placed in the Chrestosema group of genera and appears to have a strictly Neo- tropical distribution. Species from other parts of the world, previously assigned to Odon- teucoila, are transferred to Trichoplasta, which is closely related to Rhoptromeris. The type-species of Trichoplasta, T. basilewskyi Benoit, 1956, is synonymized with T. tan- ganyikensis (Weld, 1944) n. comb. (originally described in Coneucoela). Coneucoela brasi- liensis Kieffer, 1909, is the only recognized Coneucoela species and it is considered to belong to the Ganaspis complex of genera. A cladistic analysis of the Rhoptromeris group of genera concludes the paper.
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