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as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology , unless it is used in the cladistic sense, including tetrapods. [ ] [ ] the traditional term pisces (also ichthyes) is considered a typological , but not a phylogenetic classification. contents etymology
backbone) that has gills throughout life and whose limbs, if any, are in the shape of fins. [ ] unlike groupings such as birds or mammals , fish are not a single clade but a paraphyletic collection of taxa , including hagfishes , lampreys , sharks and rays , ray-finned fish , coelacanths , and lungfish...
https://en.wikipedia.org/wiki/Fish