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Whatcheeriidae

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Whatcheeriidae is an extinct family of tetrapods which lived in the Mississippian sub-period, a subdivision of the Carboniferous period. It contains the genera Pederpes, Whatcheeria, and possibly Ossinodus. Fossils of a possible whatcheeriid have been found from the Red Hill locality of Pennsylvania. If these remains are from a whatcheeriid, they extend the range of the family into the Late Devonian and suggest that advanced tetrapods may have lived alongside primitive tetrapod ancestors like Hynerpeton and Densignathus.[1] They also imply that a very long ghost lineage of whatcheeriids lived through Romer's gap, a period during the Early Carboniferous conspicuously lacking in tetrapod remains.[2]

Classification

Currently, using modern cladistic taxonomy, Whatcheeriidae is not placed in Amphibia or any other class but simply as its own family within stem-group tetrapods. The analysis below was conducted by Swartz in 2012, showing the relationship of whatcheeriids with other stem-tetrapods.[3]

Elpistostegalia

Panderichthys Panderichthys BW.jpg

Stegocephalia    

Tiktaalik Tiktaalik BW.jpg

   

Elpistostege

       

Elginerpeton Elginerpeton BW.jpg

     

Ventastega

     

Acanthostega Acanthostega BW.jpg

     

Ichthyostega Ichthyostega BW.jpg

     

Whatcheeriidae Pederpes22small.jpg

     

Colosteidae Greererpeton BW.jpg

     

Crassigyrinus Crassigyrinus BW.jpg

     

Baphetidae

   

Crown group Tetrapoda Seymouria BW.jpg

                     

References

  1. ^ Daeschler, E.B.; Clack, J.A.; Shubin, N.H. (2009). "Late Devonian tetrapod remains from Red Hill, Pennsylvania, USA: how much diversity?". Acta Zoologica. 90 (s1): 306–317. doi:10.1111/j.1463-6395.2008.00361.x.
  2. ^ Smithson, T.R.; Wood, S.P.; Marshall, J.E.A.; Clack, J.A. (2012). "Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap". Proceedings of the National Academy of Sciences of the United States of America. 109 (12): 4532–4537. doi:10.1073/pnas.1117332109. PMC 3311392. PMID 22393016.
  3. ^ Swartz, B. (2012). "A marine stem-tetrapod from the Devonian of Western North America". PLOS One. 7 (3): e33683. doi:10.1371/journal.pone.0033683. PMC 3308997. PMID 22448265.
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Whatcheeriidae: Brief Summary

provided by wikipedia EN

Whatcheeriidae is an extinct family of tetrapods which lived in the Mississippian sub-period, a subdivision of the Carboniferous period. It contains the genera Pederpes, Whatcheeria, and possibly Ossinodus. Fossils of a possible whatcheeriid have been found from the Red Hill locality of Pennsylvania. If these remains are from a whatcheeriid, they extend the range of the family into the Late Devonian and suggest that advanced tetrapods may have lived alongside primitive tetrapod ancestors like Hynerpeton and Densignathus. They also imply that a very long ghost lineage of whatcheeriids lived through Romer's gap, a period during the Early Carboniferous conspicuously lacking in tetrapod remains.

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cc-by-sa-3.0
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visit source
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wikipedia EN