Capelliniosuchus is a junior synonym of the extinct marine lizard Mosasaurus. It was discovered in Italy, and described by Simonelli, originally believing it to be a metriorhynchid crocodyliform similar to Dakosaurus. However, after re-examing the type specimen, Sirotti concluded that is was a junior synonym of Mosasaurus hoffmannii. Capellineosuchus is a mis-spelling by Romer.