Project 4605: B. M. Gee; R. R. Reisz. 2020. The amphibamiform Nanobamus macrorhinus from the early Permian of Texas. Journal of Paleontology. 94 (2):366-377.
Specimen: † Nanobamus macrorhinus (UCMP:203686)
View: Dorsal

Abstract

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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Article DOI: 10.1017/jpa.2019.72

Project DOI: 10.7934/P4605, http://dx.doi.org/10.7934/P4605
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 6 Documents
  • 36 Taxa
  • 1 Specimen
  • 108 Characters
Total size of project's media files: 9.71M

Download Project SDD File
Total scored cells: 3419
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 108
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 231
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:102/6
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MorphoBank Project 4605
  • Creation Date:
    27 March 2023
  • Publication Date:
    15 April 2024

    Authors' Institutions

    • Jilin University

    • University of Toronto



    Members

    member name taxa specimens media chars character
    media
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    (scored, NPA, "-")
    cell
    medialabels
    rules
    Bryan Gee
    Project Administrator
    3611108003419
    (3419, 0, 0)
    000


    Taxonomic Overview for Matrix 'M29212' (35 Taxa)

    taxon unscored
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    scored
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    [1] † Dendrysekos
    Taxon name last Modified on 03/27/23
    110710700001
    [2] † Sclerocephalus
    Taxon name last Modified on 03/27/23
    010810800001
    [3] † Trimerorhachis
    Taxon name last Modified on 03/27/23
    010810800001
    [4] † Acheloma
    Taxon name last Modified on 03/27/23
    110710700001
    [5] † Phonerpeton
    Taxon name last Modified on 03/27/23
    610210200001
    [6] † Fedexia
    Taxon name last Modified on 03/27/23
    29797900001
    [7] † Tambachia
    Taxon name last Modified on 03/27/23
    14949400001
    [8] † Ecolsonia
    Taxon name last Modified on 03/27/23
    510310300001
    [9] † Dissorophus
    Taxon name last Modified on 03/27/23
    10989800001
    [10] † Broiliellus
    Taxon name last Modified on 03/27/23
    12969600001
    [11] † Conjunctio
    Taxon name last Modified on 03/27/23
    19898900001
    [12] † Cacops morrisi
    Taxon name last Modified on 03/27/23
    210610600001
    [13] † Perryella
    Taxon name last Modified on 03/27/23
    710110100001
    [14] † Micromelerpeton
    Taxon name last Modified on 03/27/23
    510310300001
    [15] † Limnogyrinus
    Taxon name last Modified on 03/27/23
    9999900001
    [16] † Branchierpeton
    Taxon name last Modified on 03/27/23
    610210200001
    [17] † Eimerisaurus
    Taxon name last Modified on 03/27/23
    510310300001
    [18] † Branchiosaurus
    Taxon name last Modified on 03/27/23
    10989800001
    [19] † Apateon
    Taxon name last Modified on 03/27/23
    710110100001
    [20] † Leptorophus
    Taxon name last Modified on 03/27/23
    9999900001
    [21] † Schoenfelderpeton
    Taxon name last Modified on 03/27/23
    9999900001
    [22] † Platyrhinops
    Taxon name last Modified on 03/27/23
    410410400001
    [23] † Doleserpeton
    Taxon name last Modified on 03/27/23
    210610600001
    [24] † Amphibamus
    Taxon name last Modified on 03/27/23
    210610600001
    [25] † Georgenthalia
    Taxon name last Modified on 03/27/23
    26828200001
    [26] † Gerobatrachus
    Taxon name last Modified on 03/27/23
    13959500001
    [27] † Eoscopus
    Taxon name last Modified on 03/27/23
    210610600001
    [28] † Micropholis
    Taxon name last Modified on 03/27/23
    310510500001
    [29] † Tersomius
    Taxon name last Modified on 03/27/23
    710110100001
    [30] † Paswaioops
    Taxon name last Modified on 03/27/23
    15939300001
    [31] † Nanobamus
    Taxon name last Modified on 03/27/23
    46626200001
    [32] † Triadobatrachus
    Taxon name last Modified on 03/27/23
    27818100001
    [33] † Karaurus
    Taxon name last Modified on 03/27/23
    22868600001
    [34] † Eocaecilia
    Taxon name last Modified on 03/27/23
    22868600001
    [35] † Acanthostomatops
    Taxon name last Modified on 03/27/23
    410410400001