†unranked clade Chthonophidae Longrich et al. 2015 (worm lizard)
Reptilia - Squamata - Chthonophidae
Full reference: N. R. Longrich, J. Vinther, R. A. Pyron, D. Pisani, and J. A. Gauthier. 2015. Biogeography of worm lizards (Amphisbaenia) driven by end-Cretaceous mass extinction. Proceedings of the Royal Society, B 282:20143034
Parent taxon: Amphisbaenia according to N. R. Longrich et al. 2015
Sister taxa: Amphisbaeniformes, Amphisbaenoidea, Crythiosauridae, Glyptosaurus walbeckensis, Hodzhakulia, Hyporhinidae, Oligodontosauridae, Polyodontobaenidae, Rhineuroidea
Subtaxa: Chthonophis
Ecology: fossorial insectivore
Distribution: found only at Bug Creek Anthills (Paleocene of Montana)