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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]
It has the combination of both ray-finned and lobe-finned features, although analysis of the totality of its features places it closer to lobe-finned fish. [2] [3] [4] Early lobe-finned fishes are bony fish with fleshy, lobed, paired fins, which are joined to the body by a single bone. [5] The fins of lobe-finned fishes differ from those of all ...
Bony fishes are divided into ray-finned and lobe-finned fish. Most living fish are ray-finned, an extremely diverse and abundant group consisting of over 30,000 species. It is the largest class of vertebrates in existence today, making up more than 50% of species. [13] In the distant past, lobe-finned fish were abundant; however, there are ...
This list of lobe-finned fish is a comprehensive listing of all genera that have ever been included in the class Sarcopterygii, excluding purely vernacular terms and tetrapods. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful ( nomen dubium ), or were not formally published ( nomen nudum ...
This category contains articles about taxa at the order level in the class Actinopterygii, the ray-finned fishes. The ray-finned fishes contain most of the species of fish and these are divided into 46 orders. Most of the fishes known to aquarists and anglers are within this class. **Subcategories are listed below for all 46 orders and examples ...
Bony fish include the lobe-finned fish and the ray finned fish. The lobe-finned fish is the class of fleshy finned fishes, consisting of lungfish and coelacanths. They are bony fish with fleshy, lobed paired fins, which are joined to the body by a single bone. [12] These fins evolved into the legs of the first tetrapod land vertebrates, amphibians.
Class Placodermi (armoured fish) † Class Acanthodii ("spiny sharks", sometimes classified under Actinopterygii) † Superclass Osteichthyes (bony fish) Class Actinopterygii (ray finned fishes) Clade Sarcopterygii (lobe finned fishes, ancestors of tetrapods) The above scheme is the one most commonly encountered in non-specialist and general works.
The caudal fin is homocercal, meaning the upper and lower lobes are about equal in size. The spine ends at the caudal peduncle, the base of the caudal fin, distinguishing this group from those in which the spine extends into the upper lobe of the caudal fin, such as most fish from the Paleozoic (541 to 252 million years ago). The neural arches ...