Phylogeny of the cleptoparasitic bee genus Exaerete (Hymenoptera: Apidae) Evandson José dos Anjos-Silva, Michael S. Engel and Sergio R. Andena Apidologie, 38 5 (2007) 419-425 Published online: 10 July 2007 DOI: 10.1051/apido:2007023