Paleonet: Tetrapod Digits

Norman MacLeod N.MacLeod at
Thu May 22 07:20:39 GMT 2008

This request for information just in.


Dear Paleonetters,
I would like to ask if somebody knows of paleontological data suggesting
that one or more digits which were reduced or lost in the adult stage of a
tetrapod lineage, have reversed later during the course of the evolution
of this lineage to the ancestor's condition (i.e., if any of the
evolutionary trends documented in the fossil record that evidence a
reduction in the number of digits, for example among horses, has
eventually reversed to the gain of digits that were previously lost, for
example, a tridactyl horse evolving from a monodactyl one).
Many thanks in advance,

Dr. Paul Palmqvist, Profesor Titular
Depto. Ecología & Geología
Facultad de Ciencias, Universidad de Málaga
Campus Universitario de Teatinos
29071 Málaga (Spain)
Phone: +34 952 132002, Fax: +34 952 132000
Web page:

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