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On Sat, 7 Dec 1996 17:28:22 -0500 (EST) Rachel Clark wrote:
> Out of curiousity, what is the difference between _E. annectens_ and _E.
> regalis_? Is there any?
"Edmontosaurus, like other duckbills, varied considerably with age
and, apparently, by sex. As a result, many species formerly believed
to be other kinds of duckbilled dinosaurs are now thought to be
different ages and genders of Edmontosaurus. For example, Anatosaurus
was simply a young Edmontosaurus, and the two species of
Edmontosaurus, regalis and annectens, may represent only different
sexes of the same animal. Edmontosaurus regalis is the rarer of the
two, and has more robust, higher skull in comparison to its length.
Since, for uncertain reasons, female animals are more common among
fossils, Edmontosaurus may be the female."
[This is from Lessem,D. & Glut, D.F.: The Dinosaur Society's DINOSAUR
ENCYCLOPEDIA, New York 1993, page 173]
Hope this helps ?