Vectipelta
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Discovery and naming
The Vectipelta holotype specimens, IWCMS 1996.153 and IWCMS 2021.75, were discovered in November 1993 (nine vertebrae by Gavin Leng) and March 1994 (by Lin Spearpoint) in sediments of the Wessex Formation near Chilton Chine on the Isle of Wight, England. The holotype consists of a partial skeleton including many cervical, dorsal, sacral, and caudal vertebrae, partial pectoral and pelvic girdles, elements of the fore- and hindlimbs, and several osteoderms. At first the remains were assigned to Polacanthus.
The fossil material was initially described in a PhD thesis by Thomas J. Raven and concluded to represent a new taxon in 2021. A May 2023 study proposing a paraphyletic Nodosauridae included the "Spearpoint ankylosaur" in its phylogenetic dataset, although it was given the placeholder name "Polywotsit" in the supplementary information.
In June 2023, Pond et al. described Vectipelta barretti as a new genus and species of ankylosaurian based on these fossil remains. The generic name, "Vectipelta", is derived from "Vectis", the Roman name for the Isle of Wight. The specific name, "barretti", honours palaeontologist Paul Barrett of the Natural History Museum.
Vectipelta is the first ankylosaur identified from the Isle of Wight in 142 years, suggesting that the myriad of specimens previously assigned to Polacanthus and Hylaeosaurus may actually represent multiple taxa.
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Classification
Pond et al. (2023) recovered Vectipelta as the sister taxon to a clade formed by Dongyangopelta and Zhejiangosaurus (with this clade being sister to Ankylosauridae, and the traditional Nodosauridae recovered as paraphyletic). It is only distantly related to Polacanthus and Hylaeosaurus, which have also been found in the Wealden Group. The results of their phylogenetic analyses are shown in the cladogram below, with Wealden Group ankylosaurs highlighted:
Ecology
The Wessex Formation spans a considerable period of time of probably several million years, and therefore not all animals known from the formation are likely to have been contemporaneous. Vectipelta is likely millions of years older than Polacanthus.