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Actinopterygii (/ ˌ æ k t ɪ n ɒ p t ə ˈ r ɪ dʒ i aɪ /; from Ancient Greek ἀκτίς (aktis) 'having rays' and πτέρυξ (ptérux) 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish [2] that comprise over 50% of living vertebrate species. [3]
Acanthopterygii (meaning "spiny finned one") is a superorder of bony fishes in the class Actinopterygii.Members of this superorder are sometimes called ray-finned fishes for the characteristic sharp, bony rays in their fins; however this name is often given to the class Actinopterygii as a whole.
Fossil of Chondrosteus acipenseroides from Lyme Regis Strongylosteus hindenburgi fossil from Posidonia Shale, Staatliches Museum für Naturkunde Stuttgart. Chondrosteidae / ˌ k ɒ n d r oʊ s t i ˈ aɪ d iː / is a family of extinct marine actinopterygian fishes, known from the Early Jurassic of Europe.
Euteleostei, whose members are known as euteleosts, is a clade of bony fishes within Teleostei that evolved some 240 million years ago, although the oldest known fossil remains are only from the Early Cretaceous. [1]
The notochord, usually only found in fish embryos, is unconstricted and retained throughout life. [6] The premaxilla and maxilla bones of the skull present in other vertebrates have been lost. While larvae and early juvenile acipenseriforms have teeth, the adults are toothless, or nearly so.
The exact position in the phylogenetic tree is debated. Andreolepis has been considered a primitive actinopterygian, partly based on scale characteristics and the presence of ganoine , a homologue to true enamel , [ 8 ] which was thought to be limited to actinopterygians whereas true enamel is limited to sarcopterygians.
Kabbalistic tree with flaming sword in yellow. (The flaming sword that protects the Garden of Eden and the Tree of Life itself.) Based on diagram by Morgan Leigh: Date: 2007: Source: This is a derivative work of Morgan Leigh's "File:Tree of life wk 02.jpg" Author: Cronholm144: Other versions: derivative works. Македонски; Русский
The largest recorded length for the grunt sculpin is only 8.9 cm. Its main features are its big head, short, stout body, long pig snout, and orange fins. [3] The body is usually a yellow color with brown stripes contrasted by its very orange pectoral fins. [4]