Full reference: E. Hitchcock. 1848. An attempt to discriminate and describe the animals that made the fossil footmarks of the United States, and especially of New England. Memoirs of the American Academy of Arts and Sciences, new series 3:129-256
Parent taxon: Testudinata according to R. S. Lull 1904
Sister taxa: Amblypus, Ancyropus, Australochelys, Chengyuchelyidae, Chinlechelys, Condorchelys, Eileanchelys, Heckerochelyidae, Heckerochelys, Indochelys, Kayentachelys, Meiolaniformes, Mongolochelyidae, Naomichelys, Odontochelyidae, Odontochelys, Palaeochersis, Platycheloides, Proganochelys, Proterochersidae, Proterochersis, Saurischiocomes, Sichuanchelyidae, Spoochelys, Testudines, Testudoolithidae
Subtaxa: Helcura anguinea, Helcura littoralis, Helcura surgens
Ecology: