Sauropodomorpha

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Sauropodomorpha

[sȯ¦räp·əd·ə′mȯr·fə]
(paleontology)
A suborder of extinct reptiles in the order Saurischia, including large, solid-limbed forms.
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In North America, for instance, sauropodomorphs and ornithischians didn't even show up until after the Triassic was over, Irmis reports in an upcoming issue of Earth and Environmental Science Transactions of the Royal Society of Edinburgh.
Sauropodomorphs came in two forms--the big bipedal omnivores and the bigger, four-legged, barrel-chested, long-necked herbivores (Brachiosaurus shown).
With the possible exception of the sauropodomorph dinosaur, all identifiable tetrapod genera are shared by at least one of these other assemblages.
The post-Scots Bay tetrapod assemblage with sauropodomorph dinosaurs at Wasson Bluff is plausibly earliest Hettangian in age, and the other McCoy Brook assemblages are of even younger, presumably Hettangian age.
Especially conspicuous is the complete absence of sauropodomorph dinosaurs from the Pangaean tropics and subtropics throughout the Late Triassic, along with the absence of capitosauroid, trematosauroid, and plagiosaurid temnospondyls during the Norian and Rhaetian in the tropics.
However, this observation must be tempered by the fact that sampling of pre-ETE Rhaetian-age tetrapod faunas is generally poor, with the exception of the Newark basin, where a reasonably abundant and diverse assemblage of tetrapod tracks lacks Otozoum or other plausibly sauropodomorph tracks (Olsen et al.
The occurrence of sauropodomorph dinosaurs from the McCoy Brook Formation at Wasson Bluff is likely of earliest Hettangian age whereas the other bone-bearing localities in that formation are of older, latest Rhaetian age.
Description and evolutionary significance of the sauropodomorph dinosaurs from the Early Jurassic (Hettangian) McCoy Brook Formation.
Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon.
Taphonomy, gastroliths, and the lithophagic behavior of sauropodomorph dinosaurs.
Millions of years later, sauropodomorphs evolved into gigantic sauropods, long-necked plant eaters whose fossils are well known from elsewhere in Utah, including Dinosaur National Monument.
Early sauropodomorphs, including Seitaad, had long necks and tails with small heads and leaf-shaped teeth, suggesting that they were specialized for an herbivorous (plant-eating) diet.