GenBank accession numbers for DNA data. Gene abbreviations: COI  =  cytochrome oxidase I; ENC1  =  ectodermal-neural cortex 1-like gene; glyt  =  glycosyltransferase gene; myh6  =  myosin heavy chain 6 alpha gene; plagl2  =  pleiomorphic adenoma protein-like 2-like gene; Ptr  =  ptr hypothetical protein; rag1  =  recombination activating gene 1; zic1  =  zic family member protein 1.