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Direct Paleobiological Analysis
Miragaiavs.Hesperosaurus
A side-by-side scientific comparison of physiological dimensions, biomechanics, temporal horizons, and anatomical specializations.
Comparing 2 of maximum 4 specimens
StegosauriaMiragaia
Miragaia longicollum Mateus et al., 2009
A long-necked European stegosaur from Portugal possessing at least 17 neck vertebrae.
StegosauriaHesperosaurus
Hesperosaurus mjosi Carpenter et al., 2001
A Late Jurassic stegosaurid from Wyoming featuring wide, oval dorsal plates and a short, deep skull.
Comparative Paleobiological & Anatomical Matrix
| Feature / Trait | Miragaia | Hesperosaurus |
|---|---|---|
Total Length | 5.5–6.5 m (18.0–21.3 ft) Estimated maximum | 6–7 m (19.7–23.0 ft) Estimated maximum |
Hip Height | 1.8–2.2 m (5.9–7.2 ft) Model estimate | 2–2.5 m (6.6–8.2 ft) Model estimate |
Body Mass | 1.5–2.2 metric tons (3,307–4,850 lbs) Volumetric/allometric model | 1.8–2.8 metric tons (3,968–6,173 lbs) Volumetric/allometric model |
Epoch Horizon | Jurassic Period 153–147 Ma (million years ago) | Jurassic Period 156–150 Ma (million years ago) |
Diet & Trophic Role | Herbivore Herbivorous; browsed shrubs, cycads, and conifers using small serrated teeth. | Herbivore Low ferns, mosses, and horsetails cropped with a keratinous beak and ridged cheek teeth. |
Taxonomic Clade | Stegosauria(Infraorder) | Stegosauria(Infraorder) |
Fossil Localities | Lourinhã Formation, Miragaia, Portugal Named: 1999 | Morrison Formation, Johnson County, Wyoming, United States Named: 1985 |
Locomotion & Behavior | Unique stegosaurid herbivore possessing an exceptionally elongated neck comprising at least 17 cervical vertebrae. Preserved in the Late Jurassic Lourinhã Formation of Portugal, Miragaia shared close phylogenetic and ecological ties with North American contemporaries like [Stegosaurus](/dinosaurs/stegosaurus). | Plated stegosaurid herbivore possessing broad oval dorsal plates and tail spikes used for defense. Excavated from the northern Morrison Formation, Hesperosaurus was contemporary with the closely related [Stegosaurus](/dinosaurs/stegosaurus) and shared its habitat with apex theropods like [Allosaurus](/dinosaurs/allosaurus). |
Holotype & Fossils | Holotype preserves the anterior half of the skeleton, including intact articulated cervical column and skull fragments. | Nearly complete articulated skeleton including complete skull and soft-tissue impressions. |
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.