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The oldest known unequivocal sauropod dinosaurs are known from ... species evolved through a decrease in the growth rate of long bones as compared to rates ...
[22] [23] A study by Griebeler et al. (2013) concluded that the maximum growth rates of sauropodomorphs were comparable to those of precocial birds and the black rhinoceros but lower than the growth rates of average mammals. [23] A long-standing hypothesis has been that early sauropodomorphs were carnivorous, as expected for most early 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. [5] The prosauropod Massospondylus carinatus 15 years of age, [ 6 ] the sauropods Lapparentosaurus and Narindasaurus 43 years, [ 7 ] the coelophysoid Megapnosaurus ...
“Some animals with incredibly fast growth rates (i.e., sauropods), and by requirement, fast metabolisms, are here found to be cold-blooded, while other animals with very slow growth rates (i.e ...
In 2008, a study on the growth rates of sauropods was published by Thomas Lehman and Holly Woodward. They said that by using growth lines and length-to-mass ratios, Apatosaurus would have grown to 25 t (25 long tons; 28 short tons) in 15 years, with growth peaking at 5,000 kg (11,000 lb) in a single year.
One of the traits that helped make the dinosaurs such an evolutionary success story - thriving for 165 million years - was their fast growth rate, from massive meat-eaters like Tyrannosaurus to ...
Camarasaurus (/ ˌ k æ m ər ə ˈ s ɔː r ə s / KAM-ər-ə-SOR-əs) was a genus of quadrupedal, herbivorous dinosaurs and is the most common North American sauropod fossil. Its fossil remains have been found in the Morrison Formation, dating to the Late Jurassic epoch (Kimmeridgian to Tithonian stages), between 155 and 145 million years ago.
Growth marks are generally rare in sauropods or appearing only late in ontogeny, if at all. The lack of growth marks is suggestive of fast and continuous growth in sauropods, which supports the hypothesis that they achieved large body size through because of fast growth. [26] Ampelosaurus does not show growth marks on any bone sample. This is ...