class of ray-finned bony fishes

The Actinopterygii is the class of ray-finned fishes.

Ray-finned fish
Temporal range:
Late SilurianPresent, 425–0 Ma[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Superclass: Osteichthyes
Class: Actinopterygii
Klein, 1885

The ray-finned fishes get their name from the fact 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. Ray-finned fish first appeared in the Silurian period.

Actinopterygians are the largest class of vertebrates. There are nearly 25,000 species. They can be found in both fresh water and marine environments from the deep sea to the highest mountain streams.

Most of the living species are teleosts, which are late-comers to the fish domain. The first teleosts are in the Mesozoic era, yet now they make up 96% of all fish.[2]

Taxonomy change

References change

  1. Zhao, W.; Zhang, X.; Jia, G.; Shen, Y.; Zhu, M. (2021). "The Silurian-Devonian boundary in East Yunnan (South China) and the minimum constraint for the lungfish-tetrapod split". Science China Earth Sciences. 64 (10): 1784–1797. Bibcode:2021ScChD..64.1784Z. doi:10.1007/s11430-020-9794-8. S2CID 236438229.
  2. R. Froese; D. Pauly, eds. (February 2006). "FishBase".