a phylogenomic analysis of turtles molecular analyses of turtle relationships have overturned prevailing morphological hypotheses and prompted the development of a new taxonomy here we provide the first genomescale analysis of turtle phylogeny we sequenced 2381 ultraconserved element uce loci representing a total of 1718154bp of aligned sequence our sampling includes 32 turtle taxa representing all 14 recognized turtle families and an additional six outgroups maximum likelihood bayesian and species tree methods produce a single resolved phylogeny this robust phylogeny shows that proposed phylogenetic names correspond to wellsupported clades and this topology is more consistent with the temporal appearance of clades and paleobiogeography future studies of turtle phylogeny using fossil turtles should use this topology as a scaffold for their morphological phylogenetic analyses