Excalibosaurus is a monotypic genus of marine prehistoric reptiles that lived during the Sinemurian stage of the Early Jurassic period in what is now England. It is characterized by the extreme elonga

Xiphodracon is an extinct genus of leptonectid ichthyosaurian known from the Early Jurassic Charmouth Mudstone Formation of the United Kingdom. The genus contains a single species, Xiphodracon goldenc