The phylogenetic tree produced by the maximum likelihood analysis of sequences used in this study. Sequences from Luo et al. (2002) are identified by their GenBank Accession Number, the fish species from which the specimen was isolated, and the geographic location of the collection. The label “Profundulus portillorum isolate” identifies the sample from Honduras. The asterisk marks the only branch within the ingroup with greater than 85% bootstrap support.