Rhipidistia

Devonian Rhipidistier ( and sister group Hohlstachler: Actinistier [ Coelacanth ] )

The Rhipidistia are traditionally a taxon of Sarcopterygii ( their sister group, the Actinistia, the " bream " among the Sarcopterygii ). Erik Jarvik defined it as Porolepi Osteolepiformes; now you mentioned the Rhizodontida as belonging, but the above two orders not clearly Closing ability.

Features

Rhipidistia says, with fan-shaped dorsal fin - an uncharacteristic feature. In contrast, the ( hollow ) rays of the anterior dorsal fin of Actinistia are thorn -like amplified.

Hans -Peter Schultze ( in West Heath and Rieger 2009) identifies the Rhipidistia with the following features:

System

In strictly kladistischem thinking include the Elpistostegalia ( Panderichthyidae ) and its sister group, the land vertebrates ( Tetrapoda ) to the Rhipidistia. As far as fishy they lived from the Devonian to the Permian, the lungfish ( Dipnoi ) ( descendants of Porolepiformes ) but also to this day.

The following diagram shows the possible relationships:

Elpistostegalia → terrestrial vertebrates ( Tetrapoda )

Platycephalichthys

Tinirau

Tristichopteridae

Megalichthyidae

Medoevia

Osteolepis

Gyroptychius

Gogonasus

Canowindridae

Rhizodontidae