Parent taxon: Urodela according to K.-Q. Gao and N. H. Shubin 2001
See also Carroll 1988, Cope 1875, Estes 1981, Estes and Berberian 1970, Frank and Ramus 1996, Gadow 1898, Kuhn 1946, Parmley et al. 2007, Rieppel and Grande 1998 and Skutschas and Gubin 2012
Sister taxa: Ambystomatoidea, Cryptobranchoidea, Hemitrypus, Hynobiidae, Iridotriton, Kiyatriton, Laccotriton, Liaoxitriton, Meantes, Menopomidae, Neocaudata, Nesovtriton, Nezpercius, Plethodontidae, Pleurodelidae, Polysemia, Proteidae, Rhyacotritonidae, Salamandra, Salamandridae, Salamandroidea, Seminobatrachus, Sinerpeton, Sirenidae, Thoriidae, Valdotriton
Subtaxa: Amphiuma Muraenopsis Paleoamphiuma Proamphiuma
Ecology: amphibious carnivore
Distribution:
• Quaternary of United States (8: Florida, Georgia collections)
• Hemphillian of United States (1: Florida)
• Miocene of United States (1: Texas)
• Eocene of United States (1: Wyoming)
• Paleocene of Canada (1: Saskatchewan), United States (3: Montana, Wyoming)
• Cretaceous of United States (3: Montana, New Jersey, North Dakota)
Total: 18 collections each including a single occurrence