|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Squamata - Pachyophiidae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|M. S. Y. Lee et al. 1999||An elongated, limb-reduced marine squamate with a small skull and slender neck. Forelimb and shoulder girdle are absent, presence of hindlimb and pelvis cannot be con®rmed. Very similar to the closely related Pachyrhachis problematicus. However, it is smaller, and has a greater development of pachyostosis in the mid- dorsal ribs and vertebrae. In this region, the proximal and middle portions of the ribs are very thick, such that the intercostal space is almost obliterated. The distal ends of the ribs are round rather than ̄at in cross- section. Based on the rib morphology, the body appears to be more laterally compressed. The neural arches and bases of the neural spines are more swollen. There are also differences in the dentition: although smaller, Pachyophis has many more teeth on the dentary (approx. 23) than Pachyrhachis (12). The other tooth- bearing elements are not preserved in Pachyophis and comparisons cannot be made.|