Subclass HOLOCEPHALI
Introduction
The subclass Holocephali, a group of cartilaginous fishes, contains only one living order, the Chimaeriformes, and at least eight fossil orders. Holocephalans are usually deepwater bottom-dwelling fishes. They have the four gills covered by a soft gill cover and have grinding tooth plates. The group is thought to be the primitive sister group to the elasmobranchs, sharing the character state of having a cartilaginous skeleton. Nelson (1994) reviewed the literature on the group.
History of changes
Note that this list may be incomplete for dates prior to September 2013.
| Published | As part of group | Action Date | Action Type | Compiler(s) |
|---|---|---|---|---|
| 16-Apr-2012 | 16-Apr-2012 | MODIFIED | ||
| 12-Feb-2010 | (import) |