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RE: [belated questions about beaks]



 

-----Original Message-----
-------------------------------------------------------------
No, all the extant chelonians are toothless, although some, like the
(mostly
herbivorous) testudines do have serrated beaks that superficially look
like
teeth.

The last chelonians with teeth were the _Proganochelyids_ of the
Triassic, so
turtles have been going toothless for quite some time now.

Archosaur J
-------------------------------------------------------------
 
I would add that although Proganochelys had palatal teeth the main tooth
rows (premaxilla and maxilla in the upper jaw, dentary in the lower jaw)
were already gone, and a beak was probably present. The 'teeth' of
Proganochelys were small denticles that formed a pavement over some of the
bones of the palate.

cheers

Adam Yates
http://members.tripod.com/~jurassosauridae/index.html

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