Pachyrhachis problematicus

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Pachyrhachis problematicus

[‚pak·ē¦rak·əs ‚präb·ləmad·ə·kəs]
(paleontolgy)
A fossil snake showing features that are transitional between snakes and lizards.
References in periodicals archive ?
This slender, 3-foot-long snake, Pachyrhachis problematicus, lived in a shallow sea 95 million years ago.
In their journal report, the two paleontologists said the small, narrow, lightly built skull of Pachyrhachis had many characteristics found only in snakes.
Caldwell and Lee called this ``compelling evidence'' that Pachyrhachis was ``a primitive snake with a well-developed pelvis and hind limbs.
Caldwell and Lee did a bone-by-bone comparison between the 97-million-year-old fossil, Pachyrhachis problematicus, and other animals.