Zethus Fabricius is the largest genus among the Eumeninae with more than 217 neotropical species divided in three subgenera. The last revision of the genus made by Bohart & Stange further divides the subgenera in species groups, each considered a phylogenetic unit. A dendrogram was also presented demonstrating the relationship between these groups. Zethus (Zethoides), at that time, comprehended 39 species which were distributed in eight groups. However, this classification was obtained without the use of any phylogenetic analysis. Thus, the monophyly of the subgenus, species groups and relationship among them must be tested to corroborate Bohart & Stange's hypothesis. A phylogenetic analysis will be accomplished with the software TNT using the "Branch and Bound" algorithm and based in these results, new classifications (if judged necessary) and an identification key for the groups will be proposed.
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