Porolepiformes
| Porolepiformes Temporal range: Devonian and Carboniferous | |
|---|---|
 | |
| Various genera | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Sarcopterygii |
| Clade: | Rhipidistia |
| Clade: | Dipnomorpha |
| Class: | †Porolepimorpha |
| 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). They are thought to represent the sister group to lungfish (class Dipnoi).[1] 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.[2] He based this conclusion on the shapes of the snouts of the aforementioned groups. This view is no longer in favour in Paleontology.[3]
Jarvik also claimed the existence of choanae in porolepiformes which linked them to tetrapods, but this has remained controversial.[4] Recent phylogenetic reconstruction places porolepiformes close to lungfishes.[5]
More recent evidence has shown that at least one genus Laccognathus was most likely amphibious.[6]
Phylogeny
[edit]Mikko's Phylogeny Archive [7]
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References
[edit]- ^ Nelson, Joseph S. (16 March 2016). Fishes of the World. ISBN 978-1-119-22081-7. OCLC 951128215.
- ^ Jarvik, Erik. 1980. Basic structure and evolution of vertebrates. Vol. 1–2. Academic Press (London).
- ^ Schultze, Hans-Peter & Trueb, Linda (1991). Origins of the higher groups of tetrapods: controversy and consensus. Cornell University Press. p. 37. ISBN 978-0-8014-2497-7.
- ^ 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.
- ^ Vorobyeva, E.I. (2006). "A new species of Laccognathus (Porolepiform Crossopterygii) from the Devonian of Latvia". Paleontol. J. 40 (3). Physorg.com: 312–322. doi:10.1134/S0031030106030129. S2CID 129696592.
- ^ Haaramo, Mikko (2003). "Porolepiformes". In Mikko's Phylogeny Archive. Retrieved November 4, 2013.
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