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Topic: Procolophonia

	Palaeos Vertebrates 200.100 Anapsida: Basal Anapsids
		Introduction: The Procolophonia are a group of early herbivorous reptiles that flourished during the Permian to Triassic periods.
		Their nearest relatives seem to be the millerosaurs, a group of small unspecialised Permian reptiles.
		The Procolophonia appeared suddenly in the late Permian, when they were at their most diverse, with several lineages evolving side by side.
	www.palaeos.com /Vertebrates/Units/Unit200/100.html (677 words)

	ANNOTATIONS 18(1)
		Some of the characteristics of Ichthyostega resemble the tadpole stage of an amphibian, but interpretation is complicated by the lack of any modern representatives of the group to which it belongs.
		Owenetta is a procolophonid reptile (Order Cotylosauria, Suborder Procolophonia, Family Nyctiphruretidae) from the Upper Permian and Lower Triassic of South Africa.
		Owenetta shares several derived features with turtles, and the authors suggest that the procolophonids are the sister group to turtles, and that turtles may have arisen in the Late Permian.
	www.grisda.org /origins/18027.htm (1523 words)

	Phylogeny and Classification of Amniotes (Site not responding. Last check: 2007-09-18)
		Phylogenetic definitions, when available, are also given for the main taxa.
		Parts of the phylogeny are poorly documented (most of the unnamed clades) and will not be discussed below.
		Procolophonia is defined as "The most recent common ancestor of pareiasaurs, procolophonids, and testudines (Chelonia), and all its descendants" (Laurin & Reisz, 1995).
	tolweb.org /accessory/Phylogeny_and_Classification_of_Amniotes?acc_id=462 (2037 words)

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