Holocephali
Chimeras, ratfish, rabbitfish, king-of-the-herring, etc.
Name ìrabbitfishî from the nipping and crushing tooth plates, resembling buck teeth
Mostly a deep-water group, although some spawn in shallow water; relatively little is known about their biology
Males often have odd ìclaspersî on head and/or odd extensions of the rostrum. Presumably these function in reproduction