Actinopterygii

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Ray-finned fish Fossil range: Latest Silurian–Recent
Atlantic herring
Scientific classification
Kingdom: Animalia Phylum: Chordata Infraphylum: Gnathostomata Superclass: Osteichthyes Class: Actinopterygii Klein, 1885
Subclasses
Chondrostei Neopterygii See text for orders.

The Actinopterygii (the plural form of Actinopterygius) is a taxonomical class of animals. The animals in this class are the ray-finned fishes.

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 order Sarcopterygii.

Actinopterygians are the largest class of vertebrates. There are nearly 30,000 species. They can be found in both fresh water and marine environments from the deep sea to the highest mountain streams.

[change] Taxonomy

CLASS ACTINOPTERYGII

• Subclass Chondrostei
  • Order Polypteriformes
  • Order Acipenseriformes
• Subclass Neopterygii
  • Infraclass Holostei
    • Order Lepisosteiformes
    • Order Amiiformes
  • Infraclass Teleostei
    • Superorder Osteoglossomorpha
      • Order Osteoglossiformes
      • Order Hiodontiformes
    • Superorder Elopomorpha
      • Order Elopiformes
      • Order Albuliformes
      • Order Notacanthiformes
      • Order Anguilliformes
      • Order Saccopharyngiformes
    • Superorder Clupeomorpha
      • Order Clupeiformes
    • Superorder Ostariophysi
      • Order Gonorynchiformes
      • Order Cypriniformes
      • Order Characiformes
      • Order Gymnotiformes
      • Order Siluriformes
    • Superorder Protacanthopterygii
      • Order Salmoniformes
      • Order Esociformes
      • Order Osmeriformes
    • Superorder Stenopterygii
      • Order Ateleopodiformes
      • Order Stomiiformes
    • Superorder Cyclosquamata
      • Order Aulopiformes
    • Superorder Scopelomorpha
      • Order Myctophiformes
    • Superorder Lampridiomorpha
      • Order Lampriformes
    • Superorder Polymyxiomorpha
      • Order Polymixiiformes
    • Superorder Paracanthopterygii
      • Order Percopsiformes
      • Order Batrachoidiformes
      • Order Lophiiformes
      • Order Gadiformes
      • Order Ophidiiformes
    • Superorder Acanthopterygii
      • Order Mugiliformes
      • Order Atheriniformes
      • Order Beloniformes
      • Order Cetomimiformes
      • Order Cyprinodontiformes
      • Order Stephanoberyciformes
      • Order Beryciformes
      • Order Zeiformes
      • Order Gobiesociformes
      • Order Gasterosteiformes
      • Order Syngnathiformes
      • Order Synbranchiformes
      • Order Tetraodontiformes
      • Order Pleuronectiformes
      • Order Scorpaeniformes
      • Order Perciformes