Sidersaura
extinct genus of rebbachisaurid sauropod dinosaurs
Sidersaura (meaning "star lizard") is an extinct monotypic genus of rebbachisaurid sauropod dinosaur from the Early Cretaceous Huincul Formation of Argentina. The genus contains a single species, S. marae, known from the remains of four individuals. Sidersaura represents one of the largest known rebbachisaurids.
Discovery and naming
The Sidersaura fossil material was discovered in 2012 in sediments from the base of the Huincul Formation (Barda Atravesada de Las Campanas locality) in Cañadón de las Campanas near Villa El Chocón of Neuquén Province, Argentina. The bones were then excavated over the course of five years, during which the holotype of the giant carcharodontosaurid Meraxes was also found.
The holotype specimen, MMCh-PV 70, belonging to a mature individual, consists of a braincase fused to the skull roof and partial neurocranium, partial dorsal vertebrae, fourteen caudal vertebrae with some haemal arches, a partial left scapula, right pubic peduncle, part of both tibiae and fibulae, and several bones from the feet, including metatarsals, phalanges, ungual phalanges.
Additional specimens were also assigned as paratypes. MMCh-PV 236, belonging to a mature individual, was found in close proximity to the holotype of Meraxes, about 20 metres (66 ft) from the other Sidersaura specimens. It includes an indeterminate vertebra (likely a sacral or caudal), a dorsal rib, two metacarpals, a partial pelvic girdle including an incomplete ilium, ischia, and pubes, and the left femur and fibula. Additional bones of this specimen, including sacral neural arches, caudal vertebrae, the right femur, left tibia, right fibula, and a metatarsal, have also been found but are currently not prepared.
“Sidersaura” enters the record as extinct genus of rebbachisaurid sauropod dinosaurs. Crown Archives preserves that source wording while asking what Sidersaura, extinct and genus can confirm, complicate or overturn.
Why this record matters
“Sidersaura” is worth following because a concise public description often conceals a longer documentary argument. Here, Sidersaura, extinct and genus provides the most credible route into that argument.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Aug 24, 2026. The linked authority identifier is Q124099993. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2012.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Sidersaura” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.