The amphibamiform Nanobamus macrorhinus from the early Permian of Texas

Nanobamus macrorhinus 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 Our analysis of the taxon’s phylogenetic position within Amphibamiformes shows tha..., This matrix has been superseded by other derivates in this family of matrices and should only be reused for the express purpose of reproducing the results of Gee & Reisz (2020). Any other form of reuse risks incorporation of erroneous or outdated information. For more recent derivates, see the following:

Schoch, R. R., Henrici, A. C., & Hook, R. W. (2021). A new dissorophoid temnospondyl from the Allegheny Group (late Carboniferous) of five points, Mahoning County, Ohio (USA). Journal of Paleontology, 95(3), 638-651. https://doi.org/10.1017/jpa.2020.101

Schoch, R. R. (2022). Phylogeny of the amphibamiform temnospondyls: the relationship of taxa known by adults, larvae and neotenes. Journal of Systematic Palaeontology, 20(1), 1-30.  https://doi.org/10.1080/14772019.2022.2113831

Schoch, R. R., & Sues, H.-D. (2022). The dissorophoid temnospondyl Parioxys ferricolus from the early Permian (Cisuralian) of Texas. Journal of Paleontology, 96(4), 950-960. https://doi.org/10.1017/...,

To test the relationships of Nanobamus macrorhinus within Dissorophoidea at large and more specifically within Amphibamiformes, we utilized the matrix of Schoch (2019), which originally included 34 taxa and 108 characters. Nanobamus could be coded for 65 of the total 108 characters (60% completeness); no postcranial characters could be coded. One coding was changed from that of Schoch (2019): for character 39 (external narial opening), we changed Georgenthalia clavinasica from 0 to 1, reflecting the ‘keyhole-shaped’ naris described by Anderson et al. (2008a) that is shared with N. macrorhinus. We performed a maximum parsimony analysis in PAUP 4.0b164 for Macintosh (Swofford, 2002) with multistate characters ordered, a heuristic search, simple stepwise addition, and Dendrysekos helogenes Steen, 1934 as the outgroup. As with Schoch (2019), changing all multistate characters to be unordered did not produce any changes to the strict consensus, so these characters were maintained as order..., # Data from: The amphibamiform Nanobamus macrorhinus from the early Permian of Texas

[https://doi.org/10.5061/dryad.mq385f0](https://doi.org/10.5061/dryad.mq385f0)

## GENERAL INFORMATION

Title of Dataset: Phylogenetic data for: The amphibamiform Nanobamus macrorhinus from the early Permian of Texas

First/Corresponding Author Information

Name: Bryan M. Gee

ORCID: 0000-0003-4517-3290

Institution: University of Toronto

Email: [[e-mail]](mailto:[e-mail])

Geographic location of data collection: Mississauga, ON, Canada

Information about funding sources that supported the collection of the data: Natural Sciences and Engineering Research Council (NSERC) Discovery Grant to RRR, an Ontario Graduate Scholarship (OGS) grant to BMG, and the University of Toronto.

## SHARING/ACCESS INFORMATION

Licenses/restrictions placed on the data: CC0 license waiver ([https://creativecommons.org/public-domain/cc0/](https://creativecommons.org/public-doma...