Phylogenetic nomenclature, three-taxon statements, and unnecessary name changes.

KEVIN DE QUEIROZ1,∗ AND MICHAEL J. DONOGHUE2 1Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0162, USA; and 2Department of Ecology and Evolutionary Biology and Peabody Museum of Natural History, Yale University, New Haven, CT 06520-8106, USA; ∗Correspondence to be sent to: Division of Amphibians and Reptiles, National Museum of Natural History, Smithsonian Institution, PO Box 37012, NHB, W-200, MRC 162, Washington, DC 20013-7012, USA; E-mail: [email protected].