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From: Ben Creisler firstname.lastname@example.org
The following article in the new Journal of Vertebrate
Paleontology contains of a revised size for Orodromeus
that somehow escaped my notice in any earlier literature.
Since the femur-to-total-body length ratio in typical
hypsilophodonts is approximately 1/10, that means adult
Orodromeus were likely around 1.7 meters (5.6 ft) long,
not 2.5 (8 ft) as now generally indicated...unless
Orodromeus had a exceptionally long tail.
VARRICCHIO, DAVID J., JOHN R. HORNER, and FRANKIE D.
JACKSON, 2002. EMBRYOS AND EGGS FOR THE CRETACEOUS
THEROPOD DINOSAUR TROODON FORMOSUS. Journal of Vertebrate
Paleontology 22(3): 564-576.
"Two discoveries in the mid 1990s led to the reexamination
and eventual reidentification of the MOR 246 embryos.
First, study of Orodromeus osteology and ontogeny
indicated that this hypsilophodont attained a
comparatively small adult size (Scheetz, 1999 ),
significantly smaller than earlier estimates (Horner,
1994 ). The femur of mature individuals (e.g., MOR 473)
measures only 17 cm compared to the previously
hypothesized 30 cm. For these 12 cm long eggs to belong to
Orodromeus would imply an exceptionally
large egg to adult body size ratio...... "
Scheetz, R. D. 1999, Osteology of Orodromeus makelai
and the phylogeny of basal ornithopod dinosaurs: Ph.D.
dissertation, Montana State University, Bozeman, 186 pp.