Information from the American Museum of Natural History, with several reconstructions.

A detailed analysis of this early tetrapod by the paleontologist who discovered and described it.

Description of this Mississippian fossil site.

A list of cladograms tested for their correspondence with stratigraphic data, with references.

An article, accompanying a public radio broadcast, describing the discovery of Hynerpeton bassetti at the Red Hill fossil site. A Real Audio archive of the broadcast is included.

An early temnospondyl found in petrified tree stumps from Joggins, Nova Scotia.

Science update from the journal Nature on an early Carboniferous tetrapod, the name of which translates as "Creature from the Black Lagoon".

A description of the possible effects of the Hox gene family on vertebrate evolution.

A article about the debate between paleontologists and geologists regarding the age of the Celsius Bjerg Group, the fossil site where Ichthyostega and Acanthostega were discovered. From the journal Nature.

A description of Ted Daeschler and Neil Shubin's discovery of a transitional fish-tetrapod animal.

A detailed description of the first Devonian tetrapod to be discovered.

An article describing paleontologists Neil Shubin and Ted Daeschler and their search for early tetrapods, from Philadelphia Citypaper.net.

A description of Casineria, an early tetrapod from Scotland, from Science News Online.

Cladistic diagrams, illustrations and references.

A description of the tetrapods and other digit bearing vertebrates.

Lecture notes from the Major Features of Vertebrate Evolution class at the University of Toronto.

A discussion of the required evolutionary adaptations for moving from aquatic life to terrestrial.