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- Vertebrates - Early Tetrapods

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Acanthostega - http://en.wikipedia.org/wiki/Acanthostega - Information from Wikipedia on this extinct tetrapod genus, one of the first vertebrate animals to have recognizable limbs.

Acanthostega gunnari - http://tolweb.org/tree?group=Acanthostega&contgroup=Terrestrial_Vertebrates - A detailed analysis of this early tetrapod by Jennifer Clack, the paleontologist who discovered and described it.

Basal Tetrapod and Amphibian Trees - http://palaeo.gly.bris.ac.uk/cladestrat/amphibians.html - A list of cladograms tested for their correspondence with stratigraphic data, with references.

Central Pennsylvania Legacies: Fishing for History - http://wpsu.psu.edu/Legacies/leg-feb24.html - 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.

Creatures from the Black Lagoon - http://www.bbc.co.uk/worldservice/sci_tech/highlights/001219_blacklagoon.shtml - Information from the BBC on the discovery of a fossil of Eucritta melanolimnetes in a limestone wall in Scotland and the ensuing discoveries in the Black Lagoon from which the stone had come.

Dendrerpeton acadianum - http://www.ucmp.berkeley.edu/carboniferous/joggins.html - An early temnospondyl found in petrified tree stumps from Joggins, Nova Scotia.

Discovery of a Transitional in Romer's Gap - http://www.evolutionpages.com/pederpes%20finneyae.htm - Article on the discovery in 2002 of a tetrapod fossil, Pederpes finneyae, which seems to fill the gap between the very earliest and later tetrapods.

Eucritta melanolimnetes - http://tolweb.org/Eucritta_melanolimnetes - Description of this early tetrapod, photograph of its fossil remains, and a reconstruction of its skeleton provided by the Tree of Life Web Project.

Evolution of Limbs - http://www.gate.net/~rwms/EvoLimb.html - A description of the possible effects of the Hox gene family on vertebrate evolution.

Fish With Fingers - http://sln.fi.edu/qa98/biology/journals/part14.html - A description of Ted Daeschler and Neil Shubin's discovery of a transitional fish-tetrapod animal.

Fish to Amphibian - http://www.earthhistory.org.uk/transitional-fossils/fish-to-amphibian/ - This article discusses the evidence for the transition of certain fish into tetrapods and argues that things are not as clear-cut as they seem.

Fossil Helps Document Shift from Sea to Land - http://www.sciencenews.org/view/generic/id/33623/title/Fossil_helps_document_shift_from_sea_to_land - New fossils of an ancient, four-limbed creature, Ventastega curonica, help fill in the blanks of the evolutionary transition between fish and the first land-adapted vertebrates.

Ichthyostega - http://tolweb.org/tree?group=Ichthyostega&contgroup=Terrestrial_vertebrates - A detailed description of the first Devonian tetrapod to be discovered.

Neil and Ted's Excellent Adventure - http://www.citypaper.net/articles/070199/feat.covstory1.shtml - An article describing paleontologists Neil Shubin and Ted Daeschler and their search for early tetrapods, from Philadelphia Citypaper.net.

Terrestrial Vertebrates - http://tolweb.org/tree?group=Terrestrial_Vertebrates&contgroup=Sarcopterygii - A description of the tetrapods and other digit bearing vertebrates.

Tiktaalik roseae: A Missing Link? - http://www.earthhistory.org.uk/technical-issues/tiktaalik-roseae/ - The finding of a fossil of this species seems to close the gap between the fish Panderichthys and the tetrapod Acanthostega. This article summarises the scientific report that appeared in the journal, Nature.

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