†subfamily Dicamptodontinae Tihen 1958 (giant salamander)
Parent taxon: Dicamptodontidae according to R. Estes 1981
See also Naylor and Fox 1993
Sister taxa: Dicamptodon, Rhyacotritoninae
Subtaxa: Ambystomichnus Bargmannia Chrysotriton Geyeriella Wolterstorffiella
Ecology: amphibious carnivore
Distribution: found only at White Butte/Turtle Valley (Eocene of North Dakota)