Biology:Ankylopoda

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Short description: Former group of reptiles

Ankylopods
Temporal range: Earliest Triassic - Holocene
252–0 Ma

Proganochelys Quenstedti.jpg
Proganochelys quenstedti
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Sauria
Clade: Ankylopoda
Lyson et al., 2012
Extant subclades

Ankylopoda was a proposed clade that hypothetically contains turtles and lepidosaurs (tuatara, lizards and snakes) and their fossil relatives. This clade was historically supported based on microRNA analysis[1] as well as some cladistic analyses.[2] However, it was strongly contradicted by molecular evidence which supports Archelosauria (the grouping of turtles and archosaurs),[3] and other recent cladistic analyses have supported Archelosauria over Ankylopoda.[4]

Classification

The cladogram below follows the most likely result found by another analysis of turtle relationships, this one using only fossil evidence, published by Rainer Schoch and Hans-Dieter Sues in 2015. This study found Eunotosaurus to be an actual early stem-turtle, though other versions of the analysis found weak support for it as a parareptile.[5]

Sauria

Archosauromorpha

 Ankylopoda/Lepidosauromorpha 

Kuehneosauridae

Lepidosauria

Squamata

Rhynchocephalia

 Pantestudines? 

Eosauropterygia

Sinosaurosphargis

Placodontia

Eunotosaurus

Pappochelys

Odontochelys

 Testudinata 

Proganochelys

Testudines

See also

  • Archelosauria, an alternative clade that places turtles as sister taxon to archosaurs.

References

  1. Lyson, T.R.; Sperling, E.A.; Heimberg, A.M.; Gauthier, J.A.; King, B.L.; Peterson, K.J. (2012). "MicroRNAs support a turtle + lizard clade". Biol. Lett. 8 (1): 104–107. doi:10.1098/rsbl.2011.0477. PMID 21775315. 
  2. Schoch, R. R.; Sues, H.-D. (2015). "A Middle Triassic stem-turtle and the evolution of the turtle body plan". Nature 523 (7562): 584–7. doi:10.1038/nature14472. PMID 26106865. 
  3. Joyce, Walter G.; Anquetin, Jérémy; Cadena, Edwin-Alberto; Claude, Julien; Danilov, Igor G.; Evers, Serjoscha W.; Ferreira, Gabriel S.; Gentry, Andrew D. et al. (2021-02-09). "A nomenclature for fossil and living turtles using phylogenetically defined clade names". Swiss Journal of Palaeontology 140 (1): 5. doi:10.1186/s13358-020-00211-x. ISSN 1664-2384. https://doi.org/10.1186/s13358-020-00211-x. 
  4. Simões, Tiago R.; Kammerer, Christian F.; Caldwell, Michael W.; Pierce, Stephanie E. (2022-08-19). "Successive climate crises in the deep past drove the early evolution and radiation of reptiles" (in en). Science Advances 8 (33). doi:10.1126/sciadv.abq1898. ISSN 2375-2548. PMID 35984885. PMC 9390993. https://www.science.org/doi/10.1126/sciadv.abq1898. 
  5. Schoch, Rainer R.; Sues, Hans-Dieter (24 June 2015). "A Middle Triassic stem-turtle and the evolution of the turtle body plan". Nature 523 (7562): 584–587. doi:10.1038/nature14472. PMID 26106865. http://repository.si.edu//bitstream/10088/26633/1/SCHOCH%26SUES_2015.pdf. 

Wikidata ☰ Q20685911 entry