Procolophonia

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Procolophonians
Temporal range: Guadalupian - Late Triassic, 265–200 Ma
Sclerosaurus1DB.jpg
Sclerosaurus
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Parareptilia
Order: Procolophonomorpha
Clade: Hallucicrania
Clade: Procolophonia
Seeley, 1888
Subgroups

The Procolophonia are a suborder of herbivorous reptiles that lived from the Middle Permian till the end of the Triassic period, and are thought to be extinct today. They were originally included as a suborder of the Cotylosauria (later renamed Captorhinida Carroll 1988) but are now considered a clade of Parareptilia. They are closely related to other generally lizard-like Permian reptiles such as the Millerettidae, Bolosauridae, Acleistorhinidae, Lanthanosuchidae, and Nyctiphruretidae, all of which are included under the Anapsida or "Parareptiles" (as opposed to the Eureptilia).

Classification[edit]

There are two main groups of Procolophonia, the small, lizard-like Procolophonoidea, and the Pareiasauroidea, which include the large, armoured Pareiasauridae. Smaller groups like Rhipaeosauridae and Sclerosauridae might be placed in either superfamily, or prior to both, although according to the traditional classification of Carroll 1988 the Rhipaeosauridae are classified with the Pareiasaurs and the Sclerosaurs with the Procolophonids.

The following cladogram was found by the analysis of Linda A. Tsuji, Johannes Müller and Robert R. Reisz, 2012.[1]

Procolophonia
Procolophonoidea

Owenettidae



Procolophonidae



Pareiasauromorpha

Nycteroleteria



Pareiasauroidea




Relationship to turtles[edit]

The procolophonians were traditionally thought to be ancestral to the turtles, although experts disagreed over whether turtle ancestors would be found among the Procolophonidae, the Pareiasauridae (Lee 1995,1996, 1997), or simply a generic Procolophonian ancestor. Laurin & Reisz, 1995 and Laurin & Gauthier 1996 defined the Procolophonia cladistically as "The most recent common ancestor of pareiasaurs, procolophonids, and testudines (Chelonia), and all its descendants", and listed a number of autapomorphies. However, Rieppel and deBraga 1996 and deBraga & Rieppel, 1997 argued that turtles evolved from Sauropterygians, which would mean that the Parareptilia and Procolophonia constitute wholly extinct clades that are only distantly related to living reptiles. The first genome-wide phylogenetic analysis of turtle relationships was completed by Wang et al. (2013). Using the draft genomes of Chelonia mydas and Pelodiscus sinensis, the team used the largest turtle data set to date in their analysis and concluded that turtles are likely a sister group of crocodilians and birds (Archosauria).[2] This placement within the diapsids suggests that the turtle lineage lost diapsid skull characteristics as it now possesses an anapsid skull.

References[edit]

Notes
  1. ^ Linda A. Tsuji, Johannes Müller and Robert R. Reisz (2012). "Anatomy of Emeroleter levis and the Phylogeny of the Nycteroleter Parareptiles". Journal of Vertebrate Paleontology 32 (1): 45–67. doi:10.1080/02724634.2012.626004. 
  2. ^ Wang, Zhuo; Pascual-Anaya, J; Zadissa, A; Li, W; Niimura, Y; Huang, Z; Li, C; White, S; Xiong, Z; Fang, D; Wang, B; Ming, Y; Chen, Y; Zheng, Y; Kuraku, S; Pignatelli, M; Herrero, J; Beal, K; Nozawa, M; Li, Q; Wang, J; Zhang, H; Yu, L; Shigenobu, S; Wang, J; Liu, J; Flicek, P; Searle, S; Wang, J et al. (27 March 2013). "The draft genomes of soft-shell turtle and green sea turtle yield insights into the development and evolution of the turtle-specific body plan". Nature Genetics 45 (701–706): 701–6. doi:10.1038/ng.2615. PMC 4000948. PMID 23624526. Retrieved 15 November 2013. 
Sources

External links[edit]