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Re: Removing segnosaurs from ...

In a message dated 95-08-31 21:24:04 EDT, jshields@iol.ie (James Shields)

>The only example I can think of (which may or may not be relevant) is the
>reversion to six (or more) fingers in humans. This is not an uncommon
>occurance. I don't know if it is a real reversion or a simple mutation (if
>there is a difference).

Polydactyly occurs in many vertebrates, and it is regarded as an abnormality.
I've seen cats with up to seven digits on their forepaws.

The Solnhofen _Archaeopteryx_ is missing a phalanx in one of its toes,
according to Wellnhofer. He considers this an abnormality.