Holocephali facts for kids
Temporal range: 416–0Ma Devonian–Recent
|Hydrolagus colliei, a rat fish|
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.
Holocephali Facts for Kids. Kiddle Encyclopedia.