Vertebrate life included bony fishes, mosasaurs, plesiosaurs, sharks, and turtles. Hyperphalangy was present among extinct ichthyosaurs, plesiosaurs, and mosasaurs. Genetics likely controlled sex in ichthyosaurs, mosasaurs and plesiosaurs. Fossils found on the island include hadrosaurs, plesiosaurs, and mosasaurs. In the oceans, plesiosaurs, ichthyosaurs and ammonites were abundant. In the oceans, plesiosaurs, ichthyosaurs and ammonites dominated the seas. Their prey may have included fish, sharks, ichthyosaurs, dinosaurs and other plesiosaurs. The sea was occupied by mosasaurs, ichthyosaur, and plesiosaurs. This was the last time period in which non-avian dinosaurs, pterosaurs, plesiosaurs, and mosasaurs existed. Whether mosasaurs provided parental care, like other marine reptiles such as plesiosaurs, is currently unknown. Mosasaurs, plesiosaurs, pterosaurs and many species of plants and invertebrates also became extinct. This dental morphology is also seen in other piscivorous predators like plesiosaurs and long-snouted crocodilians. Owen supposed they resembled crocodiles or plesiosaurs. The Triassic-Jurassic extinction event wiped them all out except for the plesiosaurs. No DNA samples were found for large animals such as catfish, Greenland sharks, or plesiosaurs.