Characters in our supermatrix of Cetacea. Datasets (top) sampled for each of the 29 extant taxa in the analysis (left) are indicated by cream colored circles (see Methods for composition of composite operational taxonomic units). The chromosomal positions of most nuclear loci in the domestic cow genome are given (29 autosomes, X and Y sex chromosomes, "-" = not mapped). "Tran-" indicates sequences that flank SINE insertions . The 45 extinct taxa (Table 1) were coded for morphology only. The anatomical positions of the 304 morphological characters in the supermatrix are shown at the bottom of the figure.