Rhipidistia

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Rhipidistians
Temporal range:
Early Devonian - Present, 416–0 Ma
Ectosteorhachis.JPG
Ectosteorhachis
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Sarcopterygii
Subclass: Rhipidistia
Subgroups

The Rhipidistia, also known as dipnotetrapodomorphs (formally Dipnotetrapodomorpha)[1] are a clade of lobe-finned fishes which include the Tetrapods and lungfishes. Rhipidistia formerly referred to a subgroup of Sarcopterygii consisting of the Porolepiformes and Osteolepiformes, a definition that is now obsolete.[2] However as cladistic understanding of the vertebrates has improved over the last few decades a monophyletic Rhipidistia is now understood to include the whole of Tetrapoda and of the extant lungfishes.

Relationships[edit]

The cladogram presented below is based on studies compiled by Philippe Janvier and others for the Tree of Life Web Project,[3] Mikko's Phylogeny Archive[4] and Swartz 2012.[5]

Sarcopterygii

Onychodontidae



Actinistia (coelacanths)


Rhipidistia

Styloichthys


Dipnomorpha

Porolepiformes



Dipnoi (lungfishes)



Tetrapodomorpha

?†Tungsenia



Kenichthys




Rhizodontiformes




?†Thysanolepidae



Canowindridae




Osteolepiformes


Eotetrapodiformes

Tristichopteridae




Tinirau




Platycephalichthys


Elpistostegalia

Panderichthys




Elpistostegidae


Stegocephalia

Elginerpetonidae





Metaxygnathus



Ventastega




Tetrapoda















References[edit]

  1. ^ Joseph S., Nelson (19 May 2006). Fishes of the World. John Wiley & Sons. p. 461. ISBN 978-0-471-75644-6. Retrieved 9 May 2015. 
  2. ^ "Encyclopedia Britannica". Retrieved 3 April 2014. 
  3. ^ Janvier, Philippe. 1997. Vertebrata. Animals with backbones. Version 01 January 1997 (under construction). http://tolweb.org/Vertebrata/14829/1997.01.01 in The Tree of Life Web Project, http://tolweb.org/
  4. ^ Haaramo, Mikko (2003). "Sarcopterygii". in Mikko's Phylogeny Archive. Retrieved November 4, 2013. 
  5. ^ 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. 

External links[edit]