Chelonia: Leatherback turtle, Dermochelys coriacea, hawksbill turtle, Eretmochelys imbricata (critically endangered), Argentine snake-necked turtle, Hydromedusa tectifera, Mata mata, Geochelone nigra, geometric turtle, Psammobates geometricus (endangered), Galapagos tortoise, Dipsochelys dussumieri, and common snapping turtle, Chelydra serpentina. Chromolithograph by Adolf Glitsch from an illustration by Ernst Haeckel from Art Forms in Nature, Kunstformen der Natur, Liepzig, Germany, 1904.