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Pachyophis
Taxonomy
Pachyophis was named by Nopcsa (1923). Its type is Pachyophis woodwardi.
It was assigned to Pachyophidae by Nopcsa (1923); to Dolichosauridae by McDowell and Bogert (1954); to Serpentes by Carroll (1988); and to Pachyophiidae by Lee et al. (1999) and Lee and Scanlon (2002).
It was assigned to Pachyophidae by Nopcsa (1923); to Dolichosauridae by McDowell and Bogert (1954); to Serpentes by Carroll (1988); and to Pachyophiidae by Lee et al. (1999) and Lee and Scanlon (2002).
Species
P. woodwardi (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1923 | Pachyophis Nopcsa |
| 1954 | Pachyophis McDowell and Bogert p. 132 |
| 1988 | Pachyophis Carroll |
| 1999 | Pachyophis Lee et al. p. 510 |
| 2002 | Pachyophis Lee and Scanlon p. 136 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: Cenomanian or 100.50000 to 93.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | Bosnia and Herzegovina (Herzegovina) | P. woodwardi (53519) |