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The Actinopterygii, or ray-finned fishes, are the largest class of fishes. In existence for about 400 million years, since the Early Devonian, it consists of some 42 orders containing more than 480 families, at least 80 of which are known only from fossils.
Actinopterygii, is a major taxonomic class (or subclass) of fish, known as the "ray-finned fishes," whose diverse number of species includes about half of all known living vertebrates and 96 percent of all fish species.
Feb 15, 2018 · By. Jennifer Kennedy. Updated on February 15, 2018. The group of ray-finned fishes (Class Actinopterygii) encompasses over 20,000 species of fish that have 'rays,' or spines, in their fins. This separates them from the lobe-finned fishes (Class Sarcopterygii, e.g., the l ungfish and coelacanth), which have fleshy fins.
<p><b>Actinopterygii</b> (; from <i> actino-</i> 'having rays', and Ancient Greek <i> </i>πτέρυξ<i> (ptérux)</i> 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species.
This brilliant, spiny, and poisonous lionfish is just one of the world's 20,000 living species of actinopterygians. The name means "ray-finned," for unlike the Chondrichthyes, the fins of the Actinopterygii are webs of skin supported by bony or horny spines.
The Actinopterygii is the class of ray-finned fishes, sometimes called a taxonomy. The ray-finned fishes get their name from the fact that they have lepidotrichia or “fin rays”. Their fins are webs of skin held by bony or horny spines (“rays”). This is different from the fleshy fins of the fish in the Sarcopterygii taxonomy. Subclass Chondrostei.
Actinopterygii ( / ˌæktɪnɒptəˈrɪdʒiaɪ /; from actino- 'having rays', and Ancient Greek πτέρυξ (ptérux) 'wing, fins' ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species.
