The Acipenseriformes reference article from the English Wikipedia on 24-Jul-2004
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Acipenseriformes

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Acipenseriformes
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Actinopterygii
Order:Acipenseriformes
Families
Acipenseridae (sturgeons)
Polyodontidae (paddlefishes)
Chondrosteidae extinct
Errolichthyidae extinct
Acipenseriformes is an order of primitive ray-finned fisheses that includes the sturgeons and paddlefishes, as well as some extinct families.

Acipenseriform skeletons are largely cartilage.

References