Brody is killed by a pack of baby Plesiosaurus. A new genus was named, "Plesiosaurus". Josh arrives on the island and encounters packs of baby Plesiosaurus. The first plesiosaurian genus, the eponymous "Plesiosaurus", was named in 1821. "Plesiosaurus" fed on belemnites, fish and other prey. It contains only one species, the type, Plesiosaurus dolichodeirus. In 1824, Conybeare also provided a specific name to "Plesiosaurus"&colon; "dolichodeirus", meaning "longneck". One error is the mislabeling of Plesiosaurus as Plateosaurus. Five days into their sail, they witness a battle between an "Ichthyosaurus" and "Plesiosaurus". Unlike some better-known long-necked plesiosaurs like "Plesiosaurus" and "Elasmosaurus", "Polycotylus" had a short neck. It can perhaps be referred to "Plesiosaurus dolichodeirus". Theodor Wagner had previously referred "gigas" to "Plesiosaurus" in 1914. Mature "Plesiosaurus" also have a distinctive groove along the ventral surface of the humerus. Unequivocal specimens of "Plesiosaurus dolichodeirus" are limited to the Lyme Regis area of Dorset. Some other "Plesiosaurus" fossils are from later Sinemurian rocks.