Abstract
The left half of a tetrapod lower jaw, from the Parrsboro Formation (Pennsylvanian, Westphalian A) of Nova Scotia, is preserved as a natural mold in a sandstone. Most of the features of this lower mandible are primitive for tetrapods or non-ichthyostegalian tetrapods. Although the presence of an adsymphysial tooth plate in this specimen is regarded as the retention of an osteolepiform feature, the tusk and replacement pit on this dermal bone may be unique to this taxon. The poor preservation of the lower jaws associated with some previously described Paleozoic tetrapods, together with the unique features in other early tetrapod jaws, precludes the reference of this mandible to any known tetrapod taxon.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
