Genre
Valide Éteint

Istiorachis

Lockwood et al. 2025

Istiorachis is an extinct genus of iguanodontian ornithopod dinosaur from the Early Cretaceous Wessex Formation of the Isle of Wight, England. The genus contains a single species, Istiorachis macarthurae, known from a partial postcranial skeleton including several vertebrae, incomplete ribs, and part of the pelvis. Its vertebral neural spines are notably elongated, giving the animal a 'sail-backed' appearance.

Résumé en anglais — version française non disponible.

Plage temporelle
Trias
Jurassique
Crétacé
Paléogène
Néogène
252 201 145 66 0 Ma
Occurrences PBDB
1
Groupe
Dinosaures
Herbivore Vivant au sol, grégaire Terrestre
Istiorachis
cliquer pour agrandir
Istiorachis macarthurae holotype (MIWG 6643). The anterior-most seven caudal vertebrae in left lateral view with neural spines reconstructed. Abbreviations: Cd, caudal vertebra; SC, sacrocaudal. Scale bar represents 50 mm. © J. A. F. Lockwood, D. M. Martill & S. C. R. Maidment · CC BY 4.0 · Wikimedia
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Clade non classé
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Ornithischia Clade non classé
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Neornithischia Clade non classé
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Pyrodontia Clade non classé
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Cerapoda Clade non classé
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Ornithopoda Sous-ordre
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Iguanodontia Infraordre
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Euiguanodontia Clade non classé
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Dryomorpha Clade non classé
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Ankylopollexia Clade non classé
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Styracosterna Clade non classé
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Istiorachis Genre
Sites de découverte 1 sites géolocalisés
Répartition
Principaux pays
🇬🇧 Royaume-Uni
1
Formations géologiques
Wessex
1
Distribution temporelle
Hauterivien (132.6–125.77 Ma)
1
Espèces (1)
Istiorachis macarthurae 133 Ma
Images 1
Bibliographie
Description originale
J. A. F. Lockwood, D. M. Martill, and S. C. R. Maidment. 2025. The origins of neural spine elongation in iguanodontian dinosaurs and the osteology of a new sail‐back styracosternan (Dinosauria, Ornithischia) from the Lower Cretaceous Wealden Group of England. Papers in Palaeontology 11(4):e70034:1-38 DOI ↗
Bibliographie (1)
J. A. F. Lockwood, D. M. Martill, and S. C. R. Maidment. 2025. The origins of neural spine elongation in iguanodontian dinosaurs and the osteology of a new sail‐back styracosternan (Dinosauria, Ornithischia) from the Lower Cretaceous Wealden Group of England. Papers in Palaeontology 11(4):e70034:1-38 DOI ↗