Described species within this genus lived in the Eocene epoch, with some unnamed or questionable records from Cenomanian and Maastrichtian.[1] Fossils of species within this genus have been found in England, France, Denmark,[2]Morocco[3] and Mali.[4] Remains have also been found in North America, including Maryland and Virginia (from the early Eocene Nanjemoy Formation),[5] Georgia[6] and Mississippi.[7]
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^Rage, J.-C. (1983). "Palaeophis colossaeus nov. sp. (le plus grand Seprent connu?) de l'Eocène du Mali et le problème du genre chez les Palaeopheinae". Comptes rendus de l'Académie des Sciences de Paris. 3 (296): 1741–1744.
^Blake, S. F. "Note on a vertebra of Palaeophis from the Eocene of Maryland." Journal of the Washington Academy of Sciences 31.12 (1941): 501-503.
^Parmley, Dennis, and Harold W. Reed. "Size and age class estimates of North American Eocene palaeopheid snakes." Georgia Journal of Science 61.4 (2003): 220.
^Holman, J. Alan. "Palaeophis casei, new species, a tiny palaeophid snake from the early Eocene of Mississippi." Journal of Vertebrate Paleontology 2.2 (1982): 163-166.