Actinopterygii

The Actinopterygii is the class of ray-finned fishes.

Ray-finned fish Temporal range: Late Silurian–Present,
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Superclass:	Osteichthyes
Class:	Actinopterygii Klein, 1885
Subclasses
Cladistia (bichirs) Actinopteri Chondrostei (sturgeon and paddlefish) Neopterygii Holostei (bowfin and gars) Teleostei

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.

Taxonomy

• Chondrostei (bichirs and sturgeons)
• Neopterygii
  • Holostei (gars and bowfins)
  • Teleostei
    • Osteoglossomorpha
    • Elopomorpha (eels)
    • Clupeomorpha (herrings, anchovies)
    • Ostariophysi (goldfish, minnows, catfish, electric eels)
    • Protacanthopterygii (salmon, trout, pike)
    • Stenopterygii
    • Cyclosquamata
    • Scopelomorpha
    • Lampridiomorpha
    • Polymyxiomorpha
    • Paracanthopterygii (cod, anglerfish)
    • Acanthopterygii (mullets, flying fishes, sticklebacks, seahorses, flatfish, cichlids, mackerel, tuna, perch)

Actinopterygii Media

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  Three-spined stickleback (Gasterosteus aculeatus) males (red belly) build nests and compete to attract females to lay eggs in them. Males then defend and fan the eggs. Painting by Alexander Francis Lydon, 1879

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  Evolution of ray-finned fish

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  Nejonöga,Idunskokbok

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  Illustration by Duane Raver

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  Coelacanthflipped

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  Chinle fish Arganodus cropped cropped

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  Salamandra salamandra (white background)

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  Phylogenetic tree of marsupials derived from retroposon data (Paucituberculata)

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  British reptiles, amphibians, and fresh-water fishes (1920) (Lacerta agilis)