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  • 1
    Publication Date: 2016-04-23
    Description: Sauropod dinosaurs exhibit the largest ontogenetic size range among terrestrial vertebrates, but a dearth of very young individuals has hindered understanding of the beginning of their growth trajectory. A new specimen of Rapetosaurus krausei sheds light on early life in the smallest stage of one of the largest dinosaurs. Bones record rapid growth rates and hatching lines, indicating that this individual weighed ~3.4 kilograms at hatching. Just several weeks later, when it likely succumbed to starvation in a drought-stressed ecosystem, it had reached a mass of ~40 kilograms and was ~35 centimeters tall at the hip. Unexpectedly, Rapetosaurus limb bones grew isometrically throughout their development. Cortical remodeling, limb isometry, and thin calcified hypertrophic metaphyseal cartilages indicate an active, precocial growth strategy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Curry Rogers, Kristina -- Whitney, Megan -- D'Emic, Michael -- Bagley, Brian -- New York, N.Y. -- Science. 2016 Apr 22;352(6284):450-3. doi: 10.1126/science.aaf1509. Epub 2016 Apr 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology and Geology Departments, Macalester College, St. Paul, MN 55105, USA. rogersk@macalester.edu. ; Department of Biology, University of Washington, Seattle, WA 98185-1800, USA. ; Biology Department, Adelphi University, Garden City, NY 11530-0701, USA. ; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455-1333, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27102482" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Body Weight ; *Bone Development ; Bone and Bones/*anatomy & histology ; Calcification, Physiologic ; Cartilage/anatomy & histology/growth & development ; Dinosaurs/*anatomy & histology/*growth & development ; Droughts ; Ecosystem ; Extremities/anatomy & histology/growth & development ; Madagascar ; Starvation/veterinary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2015-05-29
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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