Original: Californosaurus perrini ('Perrin's California lizard') was an ichthyosaur, an extinct fish-like marine reptile, from the Lower Hosselkus Limestone (Carnian, Late Triassic) of California.
Simplified: Californosaurus (meaning "California lizard") was an ichthyosaur, an extinct water-dwelling reptile that lived during the time of the dinosaurs.