[dinosaur] Nanobamus (Early Permian temnospondyl) redescribed

Ben Creisler
[email protected]

A new paper:


Bryan M. Gee  and Robert R. Reisz (2019)
The amphibamiform Nanobamus macrorhinus from the early Permian of Texas.
Journal of Paleontology (advance online publication)
DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1017_jpa.2019.72&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=VUB_W-ARSWpAm7STdb0qnCvWnlYbtX66dZh6gzzP-HM&s=eXVHG3LCv3snL-yPgYsBA_QV5aNzFjg5_EUIbMzAjWA&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.cambridge.org_core_journals_journal-2Dof-2Dpaleontology_article_amphibamiform-2Dnanobamus-2Dmacrorhinus-2Dfrom-2Dthe-2Dearly-2Dpermian-2Dof-2Dtexas_A2A82EF7B83D699F827477564DDC0907&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=VUB_W-ARSWpAm7STdb0qnCvWnlYbtX66dZh6gzzP-HM&s=sq_QSDEaOTtBzCo5G4c26ckCvQOc2bJEIeg403Ujnlc&e= 



Nanobamus macrorhinus Schoch and Milner, 2014 is a small amphibamiform
temnospondyl from the early Permian Arroyo Formation of Texas. It is most
readily characterized by an elongate and partially subdivided naris. This
condition is superficially reminiscent of that seen in the coeval
trematopids, the group to which N. macrorhinus was originally referred to
under an interpretation of the holotype as a larval form. This was
discounted by later workers, but the amphibamiform affinities of the
specimen were not formalized until recently. The specimen has never been
described in the context of its amphibamiform affinities and remains poorly
characterized, never having been sampled in a phylogenetic analysis. Here
we present a complete, updated osteological description of N. macrorhinus,
including an improved characterization of its unique mosaic of
plesiomorphic and apomorphic features and clarification of the taxon's
autapomorphies. Our analysis of the taxon's phylogenetic position within
Amphibamiformes shows that N. macrorhinus was recovered as diverging after
basal amphibamiforms, e.g., the micropholids, and before derived
amphibamiforms, e.g., the amphibamids. This is supported by the unique
mixture of retained plesiomorphies, e.g., nonforeshortened postparietals
and an oval choana, and apomorphies, e.g., a narrow interorbital region and
slender palatal rami of the pterygoid. These results reflect the complexity
of terrestrial amphibamiform diversity and provide further insight into the
evolutionary history of the lissamphibian stem in terrestrial environments.


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