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re: Hoatzin claws?

Chris wrote:

Are they (the bony core of the claw that is) truly homologous with the
manual unguals of nonavian  theropods or are they a novel development?


Romer's The  Vertebrate Body - Shorter version illustrates the manus of
Anser (the goose). It has theropod claws. And I've had the pleasure of
dismantling a rhea , only the claws are curved more and sharp like
surgeon's needles.

Truly homologous.

David Peters
St. Louis