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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.
A study on bone histology of Trialestes romeri, providing evidence of a rapid growth rate, is published by Ponce, Cerda & Desojo (2025). [4]A study on the biodiversity of thalattosuchians throughout their evolutionary history, attempting to identify factors driving thalattosuchian evolution, is published by Forêt et al. (2025).
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.
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.
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).
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]
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A study on the bone histology of Aardonyx celestae and Sefapanosaurus zatronensis is published by Botha, Choiniere & Benson (2022), who interpret their findings as indicative of rapid but seasonally interrupted growth, and indicating that highly accelerated growth rates first evolved among non-sauropod sauropodomorphs weighing 1 to 2 tons ...