name = Tetrapodomorphs
fossil_range = late Early Devonian - Recent

image_width = 200px
image_caption = The basal tetrapodomorph "Tiktaalik".
regnum = Animalia
phylum = Chordata
subphylum = Vertebrata
classis = Sarcopterygii
subclassis = Tetrapodomorpha
subclassis_authority = Ahlberg, 1991
subdivision_ranks = Subgroups
subdivision =
* See text
" – exhibited a sequence of adaptations:
  • "Panderichthys", suited to muddy shallows;
  • "Tiktaalik" with limb-like fins that could take it onto land;
  • Early tetrapods in weed-filled swamps, such as:
    • "Acanthostega" which had feet with eight digits,
    • "Ichthyostega" with limbs.
Descendants also included pelagic lobe-finned fish such as coelacanth species.]

Tetrapodomorpha is a clade of vertebrates, consisting of sarcopterygians with a number of features of tetrapods. Primitive forms, like "Tiktaalik", have been referred to as "fishapods" by their discoverers, since they were half-fish half-tetrapods, at least in appearance.

Tetrapodomorpha contains the true tetrapods and several groups of related lobe-finned fishes, collectively known as the osteolepiforms.

Among the characters defining the tetrapodomorphs are modifications to the fins, notably a humerus with convex head articulating with the glenoid fossa (the socket of the shoulder joint).

Tetrapodomorph fossils are known from the early Devonian onwards, and include "Osteolepis" and "Panderichthys".

Taxonomy and phylogeny

* Class Sarcopterygii
** Subclass Tetrapodomorpha
*** "Kenichthys"
*** Order Rhizodontida
*** Superorder Osteolepidida (or Osteolepiformes)
**** Family Osteolepididae
***** "Osteolepis"
**** Family Tristichopteridae
***** "Eusthenopteron"
**** Family Megalichthyidae
***** "Megalichthys"
**** Family Canowindridae
**** (unranked) Elpistostegalia
***** Order Panderichthyida
***** "Tiktaalik"
***** "Livoniana"
***** "Metaxygnathus"
***** "Ventastega"
***** Superclass Tetrapoda

* After Benton, 2004 [http://palaeo.gly.bris.ac.uk/benton/vertclass.html] :



Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Tetrapodomorpha — Tetrapodomorpha …   Wikipédia en Français

  • Tetrapodomorpha —   Tetrapodomorpha Rango fósil: Devónico inferior Presente …   Wikipedia Español

  • Marsdenichthys — Temporal range: Late Devonian Scientific classification Kingdom: Animalia Phylum: Chordata Subphylum …   Wikipedia

  • Sarcopterygii — Temporal range: Late Silurian–Recent, 418–0 Ma …   Wikipedia

  • Osteolepiformes — Temporal range: 396–299 Ma …   Wikipedia

  • Metaxygnathus denticulus —   Metaxygnathus Rango temporal: Devónico Superior …   Wikipedia Español

  • Osteolepis — Temporal range: Middle Devonian Osteolepis macrolepidotus fossil at the Museum für Naturkunde, Berlin Scientific classification Kingdom …   Wikipedia

  • Rhizodontidae — Taxobox name = Rhizodontidae fossil range = late Middle Devonian (Givetian) Pennsylvanian regnum = Animalia phylum = Chordata infraphylum = Gnathostomata classis = Osteichthyes subclassis = Sarcopterygii infraclassis = †Tetrapodomorpha ordo =… …   Wikipedia

  • Osteolepidae — Temporal range: Devonian Osteolepis sp. Scientific classification Kingdom …   Wikipedia

  • Arbre phylogénétique (Gnathostomata) — Gnathostomata (classification phylogénétique) Cette page a pour objet de présenter un arbre phylogénétique des Gnathostomata (ou Gnathostomes), c est à dire un cladogramme mettant en lumière les relations évolutives complexes (relations groupes… …   Wikipédia en Français