Abstract Parvipelvia is a major clade of ichthyosaurians that diversified during the Triassic-Jurassic transition. The interrelationships early parvipelvians remain unclear and many genera are loosely diagnosed, such as Temnodontosaurus, an ecologically important genus from Early Jurassic Western Europe. One taxon concentrates taxonomic issues: ‘Ichthyosaurus’ acutirostris was previously assign...