Miragaia: Research Database
Stegosauria (Ornithischia) · Late Jurassic (~155–150 MYA) · Europe — Portugal (Lourinhã Formation)
Research Note: Miragaia longicollum was a stegosaurid dinosaur from the Late Jurassic Lourinhã Formation of Portugal. It is notable for its unusually long neck, comprising nine cervical vertebrae — the longest neck-to-body ratio of any known stegosaur. Its name derives from the Portuguese word for “view” (miragaia) and references the region’s scenic cliffs.
| Research Finding | Status | Grade | Year | Method | Citation | Impact |
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Costa & Mateus 2019: Description of Miragaia longicollum from the Lourinhã Formation
Costa & Mateus 2019 provide a comprehensive description of Miragaia longicollum, documenting its unusually long neck morphology and phylogenetic placement within Stegosauria
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Confirmed | A | 2019 | Fossil | Costa & Mateus, PLOS ONE | Taxonomy |
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Kriwet 2004: A new stegosaurid from the Late Jurassic of Portugal
Kriwet 2004 provides the original description of Miragaia, establishing its distinctive morphology and stegosaurid affinities within the European Jurassic dinosaur fauna
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Confirmed | A | 2004 | Fossil | Kriwet, Neues Jahrbuch für Geologie und Paläontologie | Taxonomy |
Active Debate: Neck Evolution and Stegosaurid Diversity in the Jurassic of Europe
The unusually long neck of Miragaia raises functional and ecological questions about its selective advantage. Its presence in Portugal also informs our understanding of European stegosaurid biogeography.
What We Still Do Not Know About Miragaia
- Complete skeletal morphology: Partial specimen known.
- Body mass: Estimated.
- Skin and plate arrangement: Unknown.
- Growth patterns: No bone histology data.
In Depth
At first glance you might be forgiven for thinking that Miragaia is some kind of hybrid between a stegosaur and a sauropod. Well in actuality Miragaia is a stegosaur, although the long neck and long forelimbs make it quite different from classic examples such as Stegosaurus and Kentrosaurus. The most likely cause for this different body morph is that Miragaia specialised to feed upon taller vegetation, and a longer neck would not just increase reach but could cover a larger area without the need for Miragaia to physically move its body.
The long neck was composed of at least seventeen vertebrae, some of which appear to be specially positioned dorsal vertebrae that were carried further forward. The vertebrae also seem to be more elongated than other stegosaurids. Because the front limbs were almost as high as the rear limbs, the overall posture of Miragaia would be more horizontally level to the ground. Most other stegosaurids had bodies that sloped down to the ground so that their heads were better situated for low browsing. The tail for Miragaia is still unknown but is usually reconstructed with a four spiked thagomizer like many other stegosaurids possess.
Further Reading
– A new long-necked ‘sauropod-mimic’ stegosaur and the evolution of the plated dinosaurs. Octavio Mateus, Susannah C. R. Maidment and Nicolai A. Christiansen – 2009. – Dacentrurine stegosaurs (Dinosauria): A new specimen of Miragaia longicollum from the Late Jurassic of Portugal resolves taxonomical validity and shows the occurrence of the clade in North America. – PLOS ONE. 14 (11): e0224263. – Francisco Costa & Oct�vio Mateus – 2019.
