Xenacanthida
Extinct order of sharks / From Wikipedia, the free encyclopedia
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Xenacanthida (or Xenacanthiformes) is an order or superorder of extinct shark-like chondrichthyans (cartilaginous fish) known from the Carboniferous to Triassic. They were native to freshwater, marginal marine and shallow marine habitats.[1] Some xenacanths may have grown to lengths of 5 m (16 ft).[2] Most xenacanths died out at the end of the Permian in the End-Permian Mass Extinction, with only a few forms surviving into the Triassic.
Quick Facts Scientific classification, Families and genera ...
Xenacanthida | |
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Life restoration of Xenacanthus | |
Fossil of Lebachacanthus senckenbergianus | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Chondrichthyes |
Subclass: | Elasmobranchii |
Order: | †Xenacanthida Glikman, 1964 |
Families and genera | |
See text |
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