Ichthyotitan severnensis was named by Lomax et al. (2024). Its type specimen is BRSMG Cg3178, a mandible (a large right surangular comprising the posterior end and parts of the middle and anterior sections), and it is a 3D body fossil. Its type locality is Blue Anchor Bay, Rhaetian bone bed, which is in a Rhaetian coastal siliciclastic in the Westbury Formation of the United Kingdom. It is the type species of Ichthyotitan.