![\"Massospondylus](\"https:\/\/www.newsbeep.com\/nz\/wp-content\/uploads\/2026\/02\/image_12052-Massospondylus-carinatus.jpg\")
<\/p>\nPaleontologists have unearthed fossilized bones of one of the smallest sauropodomorph dinosaurs from the Late Triassic of southern Brazil, offering fresh insights into early dinosaur development and physiology.<\/p>\n
<\/p>\n
Massospondylus carinatus, a species of small sauropodomorph dinosaur from the Early Jurassic of southern Africa. Image credit: Nobu Tamura, http:\/\/spinops.blogspot.com \/ Patty Jansen \/ Sci.News.<\/p>\n
Dr. Luciano Artemio Leal from the Universidade Estadual do Sudoeste da Bahia and colleagues collected the new dinosaur material from the Cerro da Alemoa outcrop in southern Brazil.<\/p>\n
\u201cThe Cerro da Alemoa outcrop is a significant geologic and faunistic record of the Santa Maria Supersequence in the central portion of the state of Rio Grande do Sul,\u201d they explained.<\/p>\n
The material dates to the Carnian age of the Late Triassic epoch, between 237 and 227 million years ago.<\/p>\n
It is composed of tiny bones, all smaller than 5.7 cm (2.2 inches) in length, including a partial humerus, a metatarsal, an ungual phalanx, a neural arch, and a vertebral centrum.<\/p>\n
Phylogenetic and anatomical analyses conducted by the team places the specimen firmly within the basal sauropodomorph clade.<\/p>\n
\u201cThe specimen is an important juvenile dinosaur,\u201d the paleontologists said.<\/p>\n
\u201cA combined analysis of its morphology, osteohistology, and phylogeny positions it as a basal sauropodomorph from the Brazilian Triassic period.\u201d<\/p>\n
Unlike later sauropodomorphs that achieved enormous body sizes, this early form appears to have had a much smaller stature while still in development.<\/p>\n
Crucially, the bone microstructure reveals evidence of at least one complete cycle of growth interruption with a line of arrested growth, suggesting that the individual experienced pauses in development early in life.<\/p>\n
This pattern indicates that even at small body sizes, early sauropodomorphs may have adopted flexible growth strategies \u2014 a finding that could help explain the later emergence of gigantism in this group.<\/p>\n
\u201cThe observed features suggest an individual still in development, having already undergone its first growth arrest and being midway through its second cycle,\u201d the researchers said.<\/p>\n
\u201cThese analyses suggest ontogenetic features of a juvenile sauropodomorph with a single growth arrest.\u201d<\/p>\n
\u201cOur results provide evidence for novel growth strategies during the early evolution of this group, leading to the emergence of small-bodied dinosaurs in the Triassic.\u201d<\/p>\n