origins of the beak

zen_mantid

Hatchling
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Feb 14, 2011
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#1
I have always thought that the ceph beak was derived from the ancestral molluscan radula. Now that I know they also have radulas, I wonder if b oth are derived from the ancestral radula. I cannot find anything online about it, nor did my searches here succeed.

Does anyone have any information on this?

Thanks!
 

OB

Colossal Squid
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Oct 19, 2003
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3,086
#2
Hi there zen_mantid and :welcome: to Tonmo! I would expect the beak not to be derived from the "ancestral" radula proper, as it appears more as a chitinized edge on the sphincter muscle lining the "ancestral mouth". I remember PZ doing a blog entry on beaks back in 2006, so hyperlinked herewith. have fun in our little corner of the web!
 

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