Journal
SCIENCE
Volume 352, Issue 6284, Pages 450-453Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf1509
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Funding
- National Science Foundation [EAR-0955716]
- Directorate For Geosciences
- Division Of Earth Sciences [0955716, 1528273, 1664432] Funding Source: National Science Foundation
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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 similar to 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 similar to 40 kilograms and was similar to 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.
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