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Holocephali facts for kids

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Quick facts for kids
Temporal range: 416–present Devonian–present
Hydrolagus colliei.jpg
Hydrolagus colliei, a rat fish
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Holocephali
  • Chimaeriformes
  • †Petalodontiformes
  • †Iniopterygiformes
  • †Eugeneodontida
  • †Symmoriida

Holocephali ("complete heads") is a subclass of cartilaginous fish, of which the order Chimaeriformes is the only surviving group.

Holocephali have a long fossil record that starts during the Devonian period. However, most fossils are teeth, and the body forms of numerous species are not known, or, at best, poorly understood. Sequence analysis on living chimaera suggests the whole group originated 420 million years ago in the Silurian period.

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