Palaeospondylus is a genus of extinct fish that lived during the Jurassic period. Despite being extinct, it possesses a unique and fascinating history that has led to the evolution of several synonyms. Some of the synonyms include Hybodus and Leucoraja, which also prominently feature in the Jurassic era. Additionally, Hybodus and Leucoraja exhibit distinctive features that are similar to Palaeospondylus, such as the possession of cartilaginous vertebrae. Other noteworthy synonyms for Palaeospondylus include Plesiospondylus, Ischyodus, and Lamna, which share some remarkable similarities in their physical characteristics. Despite being synonyms, these names continue to provide valuable insight into the taxonomic and evolutionary history of Palaeospondylus and several other species.