Loading species comparison matrix...
Direct Paleobiological Analysis
Brontosaurusvs.Apatosaurus
A side-by-side scientific comparison of physiological dimensions, biomechanics, temporal horizons, and anatomical specializations.
Comparing 2 of maximum 4 specimens
SauropodomorphaBrontosaurus
Brontosaurus excelsus Marsh, 1879
The iconic 'thunder lizard', resurrected as a valid and distinct genus of diplodocid sauropod in 2015.
SauropodomorphaApatosaurus
Apatosaurus ajax Marsh, 1877
A colossal, heavily built diplodocid sauropod characterized by thick cervical vertebrae and a whip-like tail.
Comparative Paleobiological & Anatomical Matrix
| Feature / Trait | Brontosaurus | Apatosaurus |
|---|---|---|
Total Length | 20–22 m (65.6–72.2 ft) Estimated maximum | 21–23 m (68.9–75.5 ft) Estimated maximum |
Hip Height | 4.5–5 m (14.8–16.4 ft) Model estimate | 4.5–5.5 m (14.8–18.0 ft) Model estimate |
Body Mass | 15.0–23.0 metric tons (33,069–50,706 lbs) Volumetric/allometric model | 18.0–28.0 metric tons (39,683–61,729 lbs) Volumetric/allometric model |
Epoch Horizon | Jurassic Period 155–152 Ma (million years ago) | Jurassic Period 152–151 Ma (million years ago) |
Diet & Trophic Role | Herbivore Herbivorous; utilized gastroliths and bacterial fermentation to digest tough gymnosperm foliage. | Herbivore Ferns, horsetails, bennettitaleans, and conifer foliage cropped with peg-like front teeth. |
Taxonomic Clade | Sauropodomorpha(Suborder) | Sauropodomorpha(Suborder) |
Fossil Localities | Como Bluff, Wyoming, United States Named: 1879 | Morrison Formation, Colorado, United States Named: 1877 |
Locomotion & Behavior | Heavy-set quadrupedal browser characterized by an exceptionally robust cervical vertebrae series. A prominent resident of the Morrison Formation, Brontosaurus shared foraging grounds with related sauropods like [Apatosaurus](/dinosaurs/apatosaurus) and [Diplodocus](/dinosaurs/diplodocus), navigating predatory threats from [Allosaurus](/dinosaurs/allosaurus). | Low-to-mid level bulk feeder traveling in herds across expansive seasonal migratory routes. In the Morrison Formation ecosystem, Apatosaurus coexisted with fellow diplodocids like [Diplodocus](/dinosaurs/diplodocus) and faced predation pressure primarily from large allosauroids such as [Allosaurus](/dinosaurs/allosaurus). |
Holotype & Fossils | Famous holotype skeleton mounted at the Yale Peabody Museum (YPM 1980). | Numerous complete and articulated skeletons excavated across Colorado, Wyoming, and Utah. |
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.