Parent taxon: Testudines according to A. Pérez-García and X. Murelaga 2013
Sister taxa: Asturichelys, Athecae, Australochelyidae, Baenidae, Casichelydia, Cheirogaster, Chelonia, Chengyuchelys, Chrysemys, Cryptodira, Cryptodiramorpha, Cryptrodiramorpha, Dermochelyoidea, Dermochelys, Dorsetochelys, Dracochelys, Geoclemys, Gopherus, Haichemydidae, Hangaiemys, Hispaniachelys, Hylaeochelys, Judithemys, Larachelus, Lindholmemydidae, Mesodermochelys, Ordosemys, Palaeomedusa, Panpleurodira, Paracryptodira, Platysternon, Plesiochelydiae, Plesiochelys, Pleurosternidae, Portlandemys, Proganochelydia, Protochelydra, Protoxinjiangchelys, Santanachelys, Siamochelys, Solnhofia, Thecophora, Tholemys, Toxochelys, Atlantochelys, Glaucochelone, Neptunochelys, Oligochelone, Pachychelys, Pseudosphargis, Therezinosaurus, Tomochelone, Scutemys, Kallokibotiidae, Metachelydia, Yumenemys, Chelydidae, Eunotosauria, Amphichelydia, Chelonichnium, Paludinosa, Chelycarapookidae, Yaxartemys, Chelone, Chelonipus, Protemys
Subtaxa: Thalassemys carva, Thalassemys hugii, Thalassemys moseri
Ecology: