Loading species comparison matrix...
Direct Paleobiological Analysis
Nigersaurusvs.Amargasaurus
A side-by-side scientific comparison of physiological dimensions, biomechanics, temporal horizons, and anatomical specializations.
Comparing 2 of maximum 4 specimens
SauropodomorphaNigersaurus
Nigersaurus taqueti Sereno et al., 1999
The 'Mesozoic lawnmower', a specialized sauropod with a wide, straight-edged mouth and 500 replaceable teeth.
SauropodomorphaAmargasaurus
Amargasaurus cazaui Salgado & Bonaparte, 1991
A striking, double-sailed dicraeosaurid sauropod from Argentina sporting parallel rows of tall neck spines.
Comparative Paleobiological & Anatomical Matrix
| Feature / Trait | Nigersaurus | Amargasaurus |
|---|---|---|
Total Length | 8.5–9.5 m (27.9–31.2 ft) Estimated maximum | 8.5–10 m (27.9–32.8 ft) Estimated maximum |
Hip Height | 2.2–2.6 m (7.2–8.5 ft) Model estimate | 2.2–2.7 m (7.2–8.9 ft) Model estimate |
Body Mass | 3.5–4.5 metric tons (7,716–9,921 lbs) Volumetric/allometric model | 2.5–4.0 metric tons (5,512–8,818 lbs) Volumetric/allometric model |
Epoch Horizon | Cretaceous Period 115–105 Ma (million years ago) | Cretaceous Period 129–122 Ma (million years ago) |
Diet & Trophic Role | Herbivore Ground-level horsetails, ferns, and soft angiosperms cropped with 500 continuously replaced teeth. | Herbivore Low-growing ferns, cycads, and horsetails stripped with pencil-shaped peg teeth. |
Taxonomic Clade | Sauropodomorpha(Suborder) | Sauropodomorpha(Suborder) |
Fossil Localities | Elrhaz Formation, Gadoufaoua, Niger Named: 1976 | La Amarga Formation, Neuquén, Argentina Named: 1984 |
Locomotion & Behavior | Specialized low-level sauropod browser with a wide, vacuum-shaped muzzle containing over 500 continuously replaced teeth. In the Elrhaz Formation of Niger, Nigersaurus grazed along riverbanks alongside the sail-backed herbivore [Ouranosaurus](/dinosaurs/ouranosaurus) and spinosaurid predator [Suchomimus](/dinosaurs/suchomimus). | Low-browsing sauropod that used its neck spines for visual signaling, defense, or sexual display. Phylogenetically allied with the Late Jurassic African [Dicraeosaurus](/dinosaurs/dicraeosaurus), Amargasaurus represents a specialized South American branch of short-necked dicraeosaurids adapted to low-tier foraging. |
Holotype & Fossils | Delicate cranial material, jaw batteries, and lightened pneumatic postcranial skeleton. | Nearly complete skeleton with intact skull, cervical spine, and postcrania at MACN, Buenos Aires. |
Paleontological Uncertainty Advisory: Anatomical dimensions, body masses, and metabolic rates are scientific estimates derived from volumetric scaling, laser scanning, and biomechanical limb bone allometry. Missing traits indicate non-preserved fossil elements rather than anatomical absence.