Yaverlandia second specimen, enigmatic reptile from Isle of Wight
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Ben Creisler
Mar 16, 2026, 10:38:26 PM (11 hours ago) Mar 16
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Ben Creisler
The enigmatic Early Cretaceous reptile Yaverlandia bitholus – conventionally interpreted as a dinosaur – was, until recently, known from a single specimen comprising a partial skull-roof from the Lower Cretaceous (Barremian) Wessex Formation of Yaverland on the south-east coast of the Isle of Wight, southern England. It possesses two low, fused and thickened, domed frontals and possession of these was originally used to justify assignment to the ornithischian dinosaur clade Pachycephalosauria. More recent studies have questioned this assignment. We report a second specimen, more abraded than the holotype but comprising almost the same section of skull. It confirms that swellings on both frontals are a normal feature of this taxon. Yaverlandia's affinities remain unresolved and better remains are required before any identification can be considered secure. However, the tradition of considering Yaverlandia a dinosaur is connected to its initial misidentification as a pachycephalosaur and it may prove to be non-dinosaurian entirely. The fact that only two Yaverlandia specimens – discovered 89 years apart – are known may indicate genuine rarity of this taxon, or its specialisation for a rarely sampled habitat.
A new paper:
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Darren Naish & Steven C. Sweetman (2026)
A second specimen of the enigmatic Wealden reptile Yaverlandia
Proceedings of the Geologists' Association 101179
https://doi.org/10.1016/j.pgeola.2026.101179
https://www.sciencedirect.com/science/article/abs/pii/S0016787826000192
Darren Naish & Steven C. Sweetman (2026)
A second specimen of the enigmatic Wealden reptile Yaverlandia
Proceedings of the Geologists' Association 101179
https://doi.org/10.1016/j.pgeola.2026.101179
https://www.sciencedirect.com/science/article/abs/pii/S0016787826000192
The enigmatic Early Cretaceous reptile Yaverlandia bitholus – conventionally interpreted as a dinosaur – was, until recently, known from a single specimen comprising a partial skull-roof from the Lower Cretaceous (Barremian) Wessex Formation of Yaverland on the south-east coast of the Isle of Wight, southern England. It possesses two low, fused and thickened, domed frontals and possession of these was originally used to justify assignment to the ornithischian dinosaur clade Pachycephalosauria. More recent studies have questioned this assignment. We report a second specimen, more abraded than the holotype but comprising almost the same section of skull. It confirms that swellings on both frontals are a normal feature of this taxon. Yaverlandia's affinities remain unresolved and better remains are required before any identification can be considered secure. However, the tradition of considering Yaverlandia a dinosaur is connected to its initial misidentification as a pachycephalosaur and it may prove to be non-dinosaurian entirely. The fact that only two Yaverlandia specimens – discovered 89 years apart – are known may indicate genuine rarity of this taxon, or its specialisation for a rarely sampled habitat.
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