Maximum likelihood phylogeny showing relationship among 56 Tursiops truncatus mitochondrial control region haplotypes sampled from the Northwest Atlantic, Gulf of Mexico, and Caribbean (see Materials and Methods). Asterisk indicates haplotypes described as “worldwide form” (Caballero et al. 2012). Solid black circles show haplotypes described as “inshore ecotype” (Caballero et al. 2012). Haplotypes generated as part of this study are shown (H1–H5). Haplotype sampling regions for the IRL and CHS, NW Atlantic alongshore grouping are indicated as follows: C = CHS, I = IRL, N = NW Atlantic alongshore, B = Bahamas, and U = Cuba. Numbers over branches show bootstrap support.