Results in Dinosaurs
The results of pioneering efforts to age dinosaur fossils using growth ring counts suggest that the longevity of the basal ceratopsian Psittacosaurus mongoliensis was 10 or 11 years. The prosauropod Massospondylus carinatus 15 years of age, the sauropod Bothriospondylus madagascariensis 43 years, the coelophysoid Megapnosaurus rhodesiensis 7 years, and the maniraptor Troodon formosus 3-5 years of age respectively. These data are being used in conjunction with mass estimated in order to infer the metabolic status and growth rates of dinosaurs.
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