Gasparinisaura is unusually well discussed because researchers can bring several kinds of evidence to the same species. A skull, thin sections of bone and mineral clusters near skeletons each illuminate a different part of its biology, with different limits.
Quick facts
| Species | Gasparinisaura cincosaltensis Coria & Salgado, 1996 |
|---|---|
| Age | Late Cretaceous, Campanian |
| Formation | Anacleto Formation, Río Negro, Argentina |
| Type specimen | MUCPv 208, partial skeleton with skull |
| Group | Dryosauridae; placement revised in 2026 |
| Notable evidence | Stone clusters in three specimens interpreted as gastroliths |
Cinco Saltos and the first specimens
The name Gasparinisaura cincosaltensis was introduced by Rodolfo Coria and Leonardo Salgado in 1996. Its holotype, MUCPv 208, is a partial skeleton that includes a near-complete cranium. Additional specimens from the Anacleto Formation have expanded the record beyond that first individual, allowing researchers to compare more than one set of bones and to examine variation within the genus.
The species name refers to Cinco Saltos, the Argentine locality associated with the discovery. The genus honours Zulma Brandoni de Gasparini for her contributions to South American vertebrate palaeontology. The fossils are from Río Negro Province in Patagonia, where Late Cretaceous deposits preserve dinosaurs, reptiles and other animals. Several skeletons improve anatomical coverage, but they do not all preserve the same regions or provide a complete growth series.
A skull re-examined in three dimensions
A 2026 study by Dieudonné, Paulina-Carabajal and Cruzado-Caballero used CT data to inspect the skull and account for distortion caused during burial and fossilisation. The authors identified additional cranial features and revised the character scoring used in evolutionary comparisons. Digital slices can reveal boundaries inside a rock-encased specimen, but they cannot restore bone that was never preserved or remove every ambiguity caused by crushing.
Their analysis placed Gasparinisaura nearer Elasmaria within Dryosauridae and proposed a revised arrangement that includes a Dysalotosaurinae grouping. The authors also argued that its large orbit is a real anatomical feature rather than merely a juvenile condition. These are interpretations from a particular character dataset. Future specimens or different taxon sampling may alter the tree, even if the observed skull structures remain available for comparison.
What the stone clusters tell us
Cerda’s 2008 study reported clusters of stones near the abdominal region of three articulated Gasparinisaura specimens. Their size distribution, sedimentary context and position were used to identify them as gastroliths rather than ordinary surrounding gravel. This is significant because direct evidence for swallowed stones is uncommon in ornithopods, and the repeated association across specimens makes the interpretation stronger than a single loose stone beside a skeleton.
Gastroliths show ingestion, not a complete feeding strategy. They may have participated in food processing, but the fossils do not preserve muscle action or the sequence of digestion. They do not prove that stones were deliberately selected, how often they were replaced, or which plants were eaten. Those questions require evidence beyond the spatial association of mineral clusters with skeletons.
Growth, relationships and the limits of a reconstruction
Histological sections examined by Cerda and Chinsamy in 2012 show fibro-lamellar bone and growth marks consistent with rapid yet periodic deposition. Different bones and individuals do not tell an identical story, so these observations support active growth while cautioning against one precise age-at-maturity figure. Bone tissue records how skeletal material formed; it does not directly reveal a yearly body length or lifespan without additional assumptions.
The skeleton suggests a small, agile ornithopod, but exact adult size and gait depend on incomplete elements and comparative scaling. No preserved colour, skin covering or group behaviour is known. The present account separates the CT-based anatomical observations, histological evidence and gastrolith interpretation because each answers a different question. For comparison with other named dinosaurs, see the A–Z dinosaur catalogue; shared catalogue placement does not imply identical quality of fossil record.
Why multiple individuals help
A group of specimens can reveal whether a feature recurs, but it does not automatically create a complete growth series. Differences may reflect age, individual variation, preservation, or the fact that separate bones came from separate animals. The gastrolith-associated skeletons and the skull used for CT work should be cited for the observations they actually preserve. Researchers can combine them at the species level while remaining alert to those distinctions. This is why the profile describes separate evidence lines instead of presenting every finding as if it came from the holotype.
Frequently asked questions
Where was Gasparinisaura found?
Several specimens come from the Anacleto Formation near Cinco Saltos in Río Negro Province, Argentina. The formation is Campanian and preserves a broader terrestrial fauna.
What did the stones near its abdomen mean?
Clusters associated with three articulated specimens have been interpreted as gastroliths, swallowed stones. Their presence supports ingestion, but does not reveal a precise digestive process or the animal’s full diet.
What changed in the 2026 skull study?
CT examination documented cranial anatomy and deformation, added character information, and proposed a placement closer to Elasmaria within Dryosauridae. This is a published phylogenetic hypothesis, not a settled classification.
How fast did Gasparinisaura grow?
Bone histology indicates rapid but periodic growth, with variation between bones and individuals. The small sample and differences among elements limit a single growth curve for the species.