Amphibamiformes
# Amphibamiformes

Amphibamiformes is an unranked clade with Dissorophoidea created by Schoch (2018). 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.

## 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):

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):

## 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
