Amphibamiformes

Amphibamiformes is an unranked clade with Dissorophoidea created by Schoch (2018).^[2] 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 Probable descendant taxon Lissamphibia survives to present
Amphibamus grandiceps
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Tetrapoda
Order:	†Temnospondyli
Superfamily:	†Dissorophoidea
Clade:	†Amphibamiformes Schoch, 2018
Subgroups
Eoscopus Georgenthalia Gerobatrachus Kermitops[1] Nanobamus Platyrhinops Plemmyradytes Rubeostratilia Amphibamidae Amphibamus Doleserpeton Micropholidae Micropholis Pasawioops Tersomius Branchiosauridae Lissamphibia?

Description

Amphibamiformes are diagnosed by a palatine and ectopterygoid reduced to narrow struts, a laterally-expanded interpterygoid vacuity, a humerus length-to-waist ratio of 6:10, and an absent basioccipital and supraoccipital.

Definition

A node-based clade; the most inclusive clade containing Amphibamus grandiceps but not Dissorophus multicinctus.

Phylogeny

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)

Amphibamiformes	Georgenthalia Eoscopus Plemmyradytes Platyrhinops Doleserpeton Gerobatrachus Amphibamus Tersomius Micropholis Pasawioops

^[3]

Anderson et al. (2008)

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

^[4]

Gallery

• 
  Branchiosaurus, a branchiosaurid of the late Carboniferous of central Europe
• 
  Amphibamus grandiceps, an amphibamid of the late Carboniferous of Illinois
• 
  Gerobatrachus hottoni, of the early Permian of Texas; this may be a close relative of present-day amphibians
• 
  Rubeostratilia texensis, of the early Permian of Texas, an amphibamiform of uncertain relations
• 
  Micropholis stowi, a micropholid of the early Triassic of South Africa and Antarctica