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[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 study indicated that Massospondylus grew along a specific growth trajectory, with little variation in the growth rate and ultimate size of an individual. [54] Another study of age determination indicated that Massospondylus grew at a maximum rate of 34.6 kg (76.3 lb) per year and was still growing at around 15 years of age.
The primary source for this list is a book called Dinosaur Facts and Figures: The Sauropods and Other Sauropodomorphs by Rubén Molina-Pérez and Asier Larramendi which contains every sauropodomorph species described up to the date of its completion (January 1, 2019), including dubious or very fragmentary specimens. [11]
As for all dwarf species, their reduced growth rate led to their small size. [ 32 ] [ 51 ] Another taxon of tiny sauropods, the saltasaurid titanosaur Ibirania , 5.7 m (18.7 ft) long, lived a non-insular context in Upper Creaceous Brazil, and is an example of nanism resultant from other ecological pressures.
The growth line annuli are found compressed between broad vascularized regions of bone with randomly oriented fibrillar patterns, known as zones. Lines of arrested growth, similar to annuli, are found between zones are avascular. They are, however, much thinner, and have relatively fewer bone fibers by volume.
Plateosaurus followed a trajectory similar to sauropods, but with a varied growth rate and final size as seen in extant reptiles, probably in response to environmental factors such as food availability. Some individuals were fully grown at only 4.8 metres' (16 ft) total length, while others reached 10 metres (33 ft).
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 ...
Monotypic sauropodomorph genera (1 C, 58 P) Multispecific sauropodomorph genera (1 C, 5 P) S. Sauropod genera (2 C)