Holocephali facts for kids
Quick facts for kids HolocephaliTemporal range: 416–present Devonian–present
|
|
|---|---|
 |
|
| Hydrolagus colliei, a rat fish | |
Scientific classification  |
|
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Holocephali |
| Orders | |
|
|
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.
See also
In Spanish: Holocéfalos para niños
All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise. Cite this article:
Holocephali Facts for Kids. Kiddle Encyclopedia.