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Amphibamiformes is an unranked clade with Dissorophoidea created by Schoch (2019).[1] It encompasses all of the taxa traditionally considered to be "amphibamids" (subsequently restricted to Doleserpeton annectens and Amphibamus grandiceps by Schoch), branchiosaurids, and hypothetically lissamphibians under the traditional temnospondyl hypothesis of lissamphibian origins. These taxa are typically small-bodied dissorophoids and form the sister group to Olsoniformes, which comprises dissorophids and trematopids.

Amphibamiformes
Temporal range: Carboniferous–Triassic
Scientific classification
Kingdom:
Phylum:
Order:
Superfamily:
(unranked):
Schoch, 2018

Contents

DiagnosisEdit

(1) Palatine and ectopterygoid reduced to narrow struts; (2) interpterygoid vacuity greatly expanded laterally; (3) humerus length:waist ratio of 6:10; (4) basioccipital and supraoccipital absent.

DefinitionEdit

The most inclusive clade containing Amphibamus grandiceps but not Dissorophus multicinctus.

PhylogenyEdit

Simplified phylogeny of Dissorophoidea from Schoch (2018):[2]


Xerodromes

Olsoniformes

Amphibamiformes

Eoscopus

Platyrhinops

Micropholidae

Tersomius

Pasawioops

Micropholis

Amphibamidae

Doleserpeton

Amphibamus

Gerobatrachus

Georgenthalia

Lissamphibia

Eocaecilia

Karaurus

Triadobatrachus

Branchiosauridae

Branchiosaurus

Apateon

Leptorophus

Schoenfelderpeton

The phylogeny of Amphibamiformes has historically been relatively unresolved. Below are earlier analyses that recover slightly different topologies (nomenclature adjusted to reflect current status and ranks):

Fröbisch & Reisz (2008)[3]Edit
Amphibamiformes

Georgenthalia

Eoscopus

Plemmyradytes

Platyrhinops

Doleserpeton

Gerobatrachus

Amphibamus

Tersomius

Micropholis

Pasawioops

Anderson et al. (2008)[4]Edit
Amphibamiformes

Tersomius

Micropholis

Eoscopus

Platyrhinops

Amphibamus

Doleserpeton

Gerobatrachus

 Batrachia 

Anura

Triadobatrachus

Caudata

Albanerpetontidae

ReferencesEdit

  1. ^ Schoch, Rainer R. (2019). "The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls". Journal of Paleontology. 93 (1): 137–156. doi:10.1017/jpa.2018.67. ISSN 0022-3360.
  2. ^ Schoch, Rainer R. (2018). "The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls". Journal of Paleontology. 93 (1): 137–156. doi:10.1017/jpa.2018.67. ISSN 0022-3360.
  3. ^ Fröbisch, Nadia B.; Reisz, Robert R. (2008). "A new Lower Permian amphibamid (Dissorophoidea, Temnospondyli) from the fissure fill deposits near Richards Spur, Oklahoma". Journal of Vertebrate Paleontology. 28 (4): 1015–1030. doi:10.1671/0272-4634-28.4.1015. ISSN 0272-4634.
  4. ^ Anderson, Jason S.; Reisz, Robert R.; Scott, Diane; Fröbisch, Nadia B.; Sumida, Stuart S. (2008). "A stem batrachian from the Early Permian of Texas and the origin of frogs and salamanders". Nature. 453 (7194): 515–518. Bibcode:2008Natur.453..515A. doi:10.1038/nature06865. ISSN 0028-0836. PMID 18497824.