Porolepiformes
Porolepiformes |
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File:POROLEPIFORMES DB15.jpg | |
Various genera | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Sarcopterygii |
Order: | †Porolepiformes Jarvik 1942 |
Genera | |
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Porolepiformes is an order of prehistoric lobe-finned fish which lived during the Devonian period (about 416 to 359 million years ago). The group contains two families: Holoptychiidae and Porolepididae.
Porolepiformes was established by the Swedish paleontologist Erik Jarvik, and were thought to have given rise to the salamanders and caecilians independently of the other tetrapods.[1] He based this conclusion on the shapes of the snouts of the aforementioned groups. This view is no longer in favour in Paleontology.[2]
Jarvik also claimed the existence of choanae in porolepiformes which linked them to tetrapods, but this has remained controversial.[3] Recent phylogenetic reconstruction places porolepiformes close to lungfishes.[4]
More recent evidence has shown that at least one genus Laccognathus was most likely amphibious.[5]
Phylogeny
Mikko's Phylogeny Archive [6]
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References
- ↑ Jarvik, Erik. 1980. Basic structure and evolution of vertebrates. Vol. 1-2. Academic Press (London).
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Clement, G., 2001. Evidence for lack of choanae in the Porolepiformes. Journal of Vertebrate Paleontology, 21: 795–802.
- ↑ Janvier , P., Early vertebrates. Oxford science publications. 1996, Oxford, New York: Clarendon Press; Oxford University Press.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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