Comptonatus chasei

Early Cretaceous (125 million years ago)

Comptonatus chasei is a large herbivorous dinosaur described in 2024 from an exceptionally complete skeleton found at Compton Bay on the south-west coast of the Isle of Wight. The specimen is the most complete dinosaur found in Britain in over a century, preserving approximately 149 bones including much of the skull, vertebral column, pelvis, and limbs. The genus name references Compton Bay, while the species name honours Nick Chase, a prolific Isle of Wight fossil collector who died in 2019 and whose contributions to the island's palaeontology were widely recognised.

The specimen was found eroding from the Wessex Formation cliffs in 2013 and was excavated over multiple field seasons by teams from the University of Portsmouth and other institutions. The extraction was a significant logistical undertaking, as the bones were embedded in hard ironstone nodules within the cliff face and required careful removal to avoid damage. The subsequent preparation took years, as each bone had to be freed from the surrounding rock using pneumatic tools and chemical preparation techniques.

Comptonatus was a large iguanodontian dinosaur, placed within the Styracosterna, the broad group that includes Iguanodon and its relatives. It was estimated at roughly six metres in length and was a robust, heavily built animal. The skull shows a combination of features not seen in other known iguanodontians, including distinctive proportions of the jaw and characteristic arrangements of the tooth batteries that were used for grinding vegetation.

The completeness of the specimen has allowed researchers to conduct detailed anatomical studies that would be impossible with more fragmentary material. CT scanning of the skull revealed internal structures including the brain case and inner ear, providing information about the animal's sensory capabilities and behaviour. The limb proportions suggest a primarily bipedal animal that could also move on all fours, consistent with the general body plan known from other iguanodontians.

The scientific importance of Comptonatus extends beyond the single specimen. Its description adds to the growing picture of iguanodontian diversity in the Wessex Formation, which now includes several distinct genera where previously only one or two were recognised. This increased taxonomic resolution suggests that the Early Cretaceous ecosystems of the Isle of Wight supported a more diverse fauna than previously appreciated, with multiple large herbivore species coexisting in the same environment.

The discovery and description of Comptonatus received widespread media coverage and brought renewed attention to the Isle of Wight's fossil heritage. The specimen demonstrates that significant new discoveries continue to be made on the island's coast, driven by the ongoing erosion that continually exposes fresh rock and releases material that has been locked in the cliffs for 125 million years.