Sauropodomorpha is the first major dinosaurian group that radiated during the Triassic. During this time the group underwent major changes in body plan, including the acquisition of features related to herbivory, large body size, and quadrupedality. By the end of the Late Triassic, approximately 30 million years after the origin of dinosaurs, sauropodomorphs predominated the niches of large herbivores in continental ecosystems throughout the world. The Triassic sauropodomorph diversity includes diverse lineages with great disparity in body size, feeding biomechanics, and locomotion types, ranging from small (∼10 kg) bipedal taxa to the large (>5 tons) quadrupedal lessemsaurids. The South American record has provided key information to understand certain stages of this evolutionary radiation. We review here the diversity and composition of sauropodomorph faunas throughout the Late Triassic of South America and highlight their contribution for understanding the evolution of this group.

Sauropodomorpha是在三叠纪期间辐射的第一个主要恐龙群。在此期间，该小组的身体计划发生了重大变化，包括获得了与食草，大体型和四足动物有关的特征。到三叠纪晚期，距恐龙起源大约三千万年，蜥脚类目动物占了整个大陆生态系统中大型草食动物的生态位。三叠纪蜥脚类目多样性包括体型，进食生物力学和运动类型差异很大的不同血统，从小型（约10公斤）双足类群到大型（> 5吨）四足纲。南美记录提供了关键信息，以了解这种进化辐射的某些阶段。