Table 1. Phylogenetic relationships of the species studied.

Suborder	Superfamily	Family	Subfamily	Species	Ecology
Pleurodira		Chelidae		Elseya dentata	Aquatic
				Chelus fimbriatus	Aquatic
	Pelomedusoidea	Podocnemididae		Pelusios sinuatus	Aquatic
				Podocnemis unifilis	Aquatic
Cryptodira	Trionychidea	Carettochelyidae		Carettochelys insculpta	Aquatic
		Dermochelyidae		Dermochelys coriacea	Marine
		Kinosternidae	Staurotypinae	Staurotypus salvinii	Aquatic
			Kinosterninae	Kinosternon bauri	Aquatic
		Trionychidae	Trionychinae	Trionyx triunguis	Aquatic
				Apalone mutica	Aquatic
	Testudinoidea	Platysternidae		Platysternon megacephalum	Dual
		Bataguridae	Geoemydinae	Rhinoclemmys pulcherrima	Terrestrial
				Cuora amboinensis	Dual
		Emydidae	Emydinae	Glyptemys (Clemmys) muhlenbergii	Dual
				Emys orbicularia	Aquatic
				Malaclemys terrapin	Aquatic
			Deirochelyinae	Trachemys (Pseudemys) scripta elegans	Aquatic
				Chrysemys picta picta	Aquatic
		Testudinidae (Tortoises)		Testudo horsfieldi	Terrestrial
				Gopherus polyphemus	Terrestrial
		Chelydridae		Chelydra serpentina	Aquatic
				Macroclemys temminckii	Aquatic
	Chelonioidea (Sea Turtles)	Cheloniidae		Carretta caretta	Marine
				Chelonia mydas	Marine
				Lepidochelys kempii	Marine

At least one representative from each family of testudines was included in this study, with the exception of the Dermatemydidae, a monotypic family containing Dermatemys mawii for which no museum specimen was available.