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| TITLE: | A redescription of the cranial anatomy of Seymouria baylorensis, the best known seymouriamorph (Vertebrata: Seymouriamorpha)
| | AUTHOR: | Michel Laurin
| | JOURNAL: | PaleoBios
| | PUBLISHED: | Jul 13, 1996
| | NOTES: | 17(1)
| | ABSTRACT: | Seymouriamorphs are generally thought to be closely related to amniotes. Preparation of several specimens of Seymouria baylorensis from the Lower Permian of Texas requires a reevaluation of the affinities of seymouriamorphs. Contrary to previous reports, S. baylorensis has a long cultriform process but lacks mandibular fenestrae, and the transverse flange extends ventrolaterally, as in amniotes, rather than horizontally. The epipterygoid is not fused to the pterygoid. Mature specimens of S. baylorensis lack lateral-line canal grooves. In all these respects, Seymouria is more similar to amniotes than previously considered, but these similarities do not necessarily imply that seymouriamorphs are closely related to amniotes. The presence of a paired atlantal pleurocentrum and other primitive character states suggest that seymouriamorphs do not belong to the crown group Tetrapoda.
| | COLLECTION: | PaleoBios Archive Public
| | ID: | 212
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