Palaeonisciformes
Extinct order of fishes / From Wikipedia, the free encyclopedia
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The Palaeonisciformes, commonly known as "palaeoniscoids" (also spelled "paleoniscoid", or alternatively "paleoniscids") are an extinct grouping of primitive ray-finned fish (Actinopterygii), spanning from the Silurian/Devonian to the Cretaceous. They are generally considered paraphyletic, but their exact relationships to living ray-finned fish are uncertain.[1] While some and perhaps most palaeoniscoids likely belong to the stem-group of Actinopteryii,[2] it has been suggested that some may belong to the crown group,[3] with some of these possibly related to Cladistia (containing bichirs) and/or Chondrostei (which contains sturgeons and paddlefish).[4] Many palaeoniscoids share a conservative body shape and a similar arrangement of skull bones.[5]
Palaeonisciformes | |
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†Palaeoniscum restoration | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | †Palaeonisciformes Hay 1902 |
Suborders | |
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Synonyms | |
Palaeoniscida Moy-Thomas & Miles 1971 |