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I have read that Galton reported a dimorphism in the structure of the sacrum
The text is from "The Dinosauria":
Some specimens have 16 dorsal and 5 sacral vertebrae, but the centrum of
the last dorsal is expanded caudally and forms extensive sutural contacts
with the first sacral ribs.
By contrast certain individuals have 15 dorsal and 6 sacral vertebrae; the
first vertebra is a sacral because its ribs are sutured to both centrum and
Does someone tell me if this is a sexual dimorphism from male to female or
if this is an ontogenetic stage?
Thank you in advanced and sorry for the English
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