Updated

Updated · Sci.News · Nov 12

South Africa Yields 220-Million-Year-Old Nyana Skull, Revealing New Sauropodomorph Species

Updated

Updated · Sci.News · Nov 12

South Africa Yields 220-Million-Year-Old Nyana Skull, Revealing New Sauropodomorph Species

Q: If a three-year-old Nyana rooiwalensis already outgrew its peers, just how massive could this bipedal dinosaur get in adulthood?

Adult **Nyana rooiwalensis may have reached several tonnes, potentially into multi-ton body masses**, according to the researchers’ growth extrapolations. That estimate is based on unusually large size for a very young animal. Bone histology indicates the fossil was still actively growing and was likely in its third year when it died, yet it was already more than four times larger than juveniles of comparable age in related dinosaurs such as *Massospondylus* and *Mussaurus*. Its preserved skull was about 21.3 centimeters long, and the full skull is thought to have exceeded that of the largest known adult *Massospondylus*. Scientists have not given a precise adult weight because the species is known from a single juvenile specimen, not a fully grown individual. That means any body-mass estimate remains provisional. Still, the combination of its exceptional juvenile size, open skull sutures, and bone tissue showing continued rapid growth strongly suggests it was on track to become a very large early sauropodomorph. What makes that important is not just the size itself, but what it says about dinosaur evolution. If a bipedal sauropodomorph in the Late Triassic was already growing this fast and heading toward multi-ton size, then the biological foundations of later giant long-necked sauropods were emerging earlier than many fossils had shown.

3 articles · Updated · Sci.News · Nov 12

A near-complete 21.3-cm skull and other bones from Eastern Cape have been identified as Nyana rooiwalensis, a previously unknown sauropodomorph that lived about 220 million years ago.
The fossil is significant because Late Triassic sauropodomorph skulls are rare, and researchers say it is South Africa’s first almost complete articulated dinosaur skull from that period.
Bone growth rings, open skull sutures and limb anatomy show the animal was still growing, at least in its third year, yet already more than four times the size of comparable juvenile Massospondylus and Mussaurus.
That combination suggests rapid growth evolved early in sauropodomorph history, before the giant long-necked sauropods appeared, and implies adults may have reached multi-ton body masses.
Phylogenetic analyses place Nyana close to Sarahsaurus or Ngwevu, potentially extending evidence for early massopodan or massospondylid dispersal across southern Gondwana and into North America.