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Neustosaurus
''Neustosaurus'' is a genus of marine crocodyliform from the Early Cretaceous. ''Neustosaurus'' was a carnivore that spent much, if not all, its life out at sea. No ''Neustosaurus'' eggs or nest have been discovered, so little is known of the reptile's lifecycle, unlike other large marine reptiles of the Mesozoic, such as plesiosaurs or ichthyosaurs which are known to give birth to live young out at sea. Where ''Neustosaurus'' mated, whether on land or at sea, is currently unknown. The name ''Neustosaurus'' means "Swimming lizard", and is derived from the Greek ''Neustos''- ("swimming") and -''sauros'' ("lizard").
==History of discovery==
There is only a single described species within ''Neustosaurus'', the type species ''N. gigondarum''.〔 The holotype material consists of only the posterior of trunk and the tail, discovered in France, in Gigondas.〔 However, identifying metriorhynchid genera from post-cranials is not easy,〔Fraas E. 1902. Die Meer-Krocodilier (Thalattosuchia) des oberen Jura unter specieller Berücksichtigung von ''Dacosaurus'' und ''Geosaurus''. ''Paleontographica'' 49: 1-72.〕 as such until diagnostic material is discovered ''Neustosaurus'' is considered nomen dubium.〔Buffetaut, E. 1982. Radiation évolutive, paléoécologie et biogéographie des Crocodiliens mésosuchienes. ''Mémoires Societé Geologique de France'' 142: 1–88.〕 ''Neustosaurus'' has been considered a junior synonym of either ''Dakosaurus'' 〔 and ''Geosaurus'' 〔Piveteau J. 1928. Le reptile de Gigondas et l’évolution des Métriorhynchidés. ''Annales de Paléontologie'' 17: 30-47.〕 over the past 100 years. In 2009, Young and Andrade published a re-description of ''Geosaurus'', examining its relationships and the validity of species lumped into the genus. They concluded that ''Neustosaurus'' is a nomen dubium, but if new material was discovered it would be the senior synonym of ''Cricosaurus''.〔Young, Mark T., and Marco Brandalise de Andrade, 2009. "What is ''Geosaurus''? Redescription of ''Geosaurus giganteus'' (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany." ''Zoological Journal of the Linnean Society'', 157: 551-585.〕
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