New nests of Zethus reveal unexpected architecture variation in the olmecus species group (Hymenoptera, Vespidae) por Rogério Botion Lopes, Gabriel A. R. Melo

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Discovery of the pincer wasp Thaumatodryininae (Hymenoptera, Dryinidae) in Burmese amber, with description of a new genus and the first phylogenetic analysis of the subfamily por André L. Martins, Gabriel A. R. Melo

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Bayesian and parsimony analyses based on morphological data reveal a new genus of spilomenine wasps (Hymenoptera: Crabronidae: Pemphredoninae) from Australia por Brunno B. Rosa, Gabriel A.R. Melo

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The type material of the Neotropical bee genus Habralictus Moure (Apidae, Halictinae) in the Museum für Naturkunde, Berlin, Germany por Gabriel A.R. Melo, Júlia Alberti de Liz

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A revision of the South American species of the cleptoparasitic bee genus Triepeolus Robertson, 1901 (Hymenoptera: Apidae) por Thomas M. Onuferko, Molly G. Rightmyer, Gabriel A.R. Melo, Arturo Roig-Alsina

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