Name: Chthonophis‭(‬Beneath the earth snake‭)‬.
Phonetic: Sif-on-off-iss.
Named By: N.‭ ‬R.‭ ‬Longrich,‭ ‬J.‭ ‬Vinther,‭ ‬R.‭ ‬A.‭ ‬Pyron,‭ ‬D.‭ ‬Pisani‭ & ‬J.‭ ‬A.‭ ‬Gauthier‭ ‬-‭ ‬2015.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Squamata,‭ ‬Chthonophidae.
Species: C.‭ ‬subterraneus‭ (‬type‭)‬.
Diet: Uncertain.
Size: Unknown due to lack of remains.
Known locations: USA,‭ ‬Montana‭ ‬-‭ ‬Fort Union Formation‭?
Time period: Paleocene.
Fossil representation: Partial lower jaw that seems to have been partially digested.

       Although known only from a partial jaw,‭ ‬Chthonophis may represent one of the earliest appearances of an Amphisbaenia lizard.‭ ‬Also known as worm lizards,‭ ‬amphisbaenians are lizards that have lost limbs giving them a superficial resemblance to snakes,‭ ‬although even a basic study of them will reveal several clear differences.

Further reading
-‭ ‬Biogeography of worm lizards‭ (‬Amphisbaenia‭) ‬driven by end-Cretaceous mass extinction.‭ ‬-‭ ‬Proceedings of the Royal Society,‭ ‬B‭ ‬282:20143034.‭ ‬-‭ ‬N.‭ ‬R.‭ ‬Longrich,‭ ‬J.‭ ‬Vinther,‭ ‬R.‭ ‬A.‭ ‬Pyron,‭ ‬D.‭ ‬Pisani‭ & ‬J.‭ ‬A.‭ ‬Gauthier‭ ‬-‭ ‬2015.


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