- Joined
- Sep 26, 2005
- Messages
- 352
Hey all. As most of you are no doubt aware of my studiers at the moment, I have decided to start researching the evolutionary history of Cephalopods' armature, with some help from Phil's family tree to help me along. I have thusfar discovered that Belemnites had hooks, but not suckers, which is fine (although Kat said the paper was a bit dubious at times- Engeser & Clarke Cephalopod Hooks, both recent and fossil[1988]) and from a few other sources.
I know also that Nutiloids don't have armaure except maybe a row of cirri or something? and they come almost directly from the Orthocone branch. Did ammonites have suckers or hooks, or is it just a characteristic of the Coleoidea?
Also, I suppose this means that hooks evolved before suckers then, or did they evolve alongside, just in a different branch? Most likely a responce to prey?
Any comments are appreciated.
Graeme
I know also that Nutiloids don't have armaure except maybe a row of cirri or something? and they come almost directly from the Orthocone branch. Did ammonites have suckers or hooks, or is it just a characteristic of the Coleoidea?
Also, I suppose this means that hooks evolved before suckers then, or did they evolve alongside, just in a different branch? Most likely a responce to prey?
Any comments are appreciated.
Graeme