Porolepiform

Porolepiformes Temporal range: 416–359 Ma PreЄ Є O S D C P T J K Pg N Devonian
Various genera
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sarcopterygii
Order:	†Porolepiformes Jarvik 1942
Genera
†Porolepidae †Heimenia ØRvik 1969 †Porolepis †Holoptychiidae Owen 1860 ?†Duffichthys Ahlberg 1992 ?†Ventalepis Schultze 1980 †Pseudosauripterus †Glyptolepis †Holoptychus †Laccognathus

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. He based this conclusion on the shapes of the snouts of the aforementioned groups. This view is no longer in favour in Paleontology.

Jarvik also claimed the existence of choanae in porolepiformes which linked them to tetrapods, but this has remained controversial. Recent phylogenetic reconstruction places porolepiformes close to lungfishes.

More recent evidence has shown that at least one genus Laccognathus was most likely amphibious.

Mikko's Phylogeny Archive

†Heimenia ensis ØRvik 1969

†P. brevis Jarvik 1937

†P. elongata Jarvik 1937

†P. posnaniensis (Kade 1858)

†P. siegenensis Gross 1935

†P. spitsbergensis Jarvik 1937

?†Ventalepis ketleriensis Schultze 1980

?†Duffichthys mirabilis Ahlberg 1992

†Pseudosauripterus anglicus (Woodward 1891)

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