TY - JOUR
T1 - A comparative embryological study of two ornithischian dinosaurs
AU - Horner, John R.
AU - Weishampel, David B.
PY - 1988
Y1 - 1988
N2 - Embryonic dinosaur remains are extremely rare1,2 and with the exception of the specimens described here, are so fragmentary that they have yielded little or no information useful for palaeobiological interpretation. We report here the first well-documented association of dinosaur eggs containing embryos, juveniles and adults from the fossil record. The material, attributable to a new hypsilophodontid, Orodromeus makelai, n. gen., n. sp., and the hadrosaurid Maiasaura peeblesorum, comes from the Upper Cretaceous Two Medicine Formation of western Montana3. Osteo-logical and histological studies of these two animals indicate structural and morphological adaptations for their respective growth patterns and neonate behaviour.
AB - Embryonic dinosaur remains are extremely rare1,2 and with the exception of the specimens described here, are so fragmentary that they have yielded little or no information useful for palaeobiological interpretation. We report here the first well-documented association of dinosaur eggs containing embryos, juveniles and adults from the fossil record. The material, attributable to a new hypsilophodontid, Orodromeus makelai, n. gen., n. sp., and the hadrosaurid Maiasaura peeblesorum, comes from the Upper Cretaceous Two Medicine Formation of western Montana3. Osteo-logical and histological studies of these two animals indicate structural and morphological adaptations for their respective growth patterns and neonate behaviour.
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U2 - 10.1038/332256a0
DO - 10.1038/332256a0
M3 - Article
AN - SCOPUS:0023757270
SN - 0028-0836
VL - 332
SP - 256
EP - 257
JO - Nature
JF - Nature
IS - 6161
ER -