Amphibamiformes

Amphibamiformes is an unranked clade with Dissorophoidea created by Schoch (2018).[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 PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Order:	†Temnospondyli
Superfamily:	†Dissorophoidea
Clade:	†Amphibamiformes Schoch, 2018
Subgroups
Eoscopus Georgenthalia Gerobatrachus Nanobamus Platyrhinops Plemmyradytes Rubeostratilia Amphibamidae Amphibamus Doleserpeton Micropholidae Micropholis Pasawioops Tersomius Branchiosauridae Lissamphibia?

Diagnosis

(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.

Definition

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

Phylogeny

Simplified phylogeny of Dissorophoidea from Schoch (2018):[1]

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)[2]

Amphibamiformes	Georgenthalia       Eoscopus       Plemmyradytes       Platyrhinops       Doleserpeton       Gerobatrachus     Amphibamus                   Tersomius       Micropholis     Pasawioops

Anderson et al. (2008)[3]

Amphibamiformes	Tersomius     Micropholis         Eoscopus       Platyrhinops       Amphibamus       Doleserpeton       Gerobatrachus    Batrachia      Anura     Triadobatrachus         Caudata     Albanerpetontidae

References

1. 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.
2. 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.
3. 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.