Chronogram based on the maximum likelihood phylogeny of the combined Mll , Myh6 , Ptr , Rag1 , Rag2 , and Ryr3 genes. Numbers above nodes indicate Bayesian posterior probabilities, and those at terminal branches indicate vertebra number of each species. The ancestral state reconstructions of vertebra number are also shown. Interstitial species are indicated by the blue background. Illustrations of pelvic fin morphologies are provided for the six genetically distinct groups of L. elongatus.