Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Aphrosaurus (meaning "sea-foam lizard") is an extinct genus of plesiosaur from the Mesozoic. The type species is Aphrosaurus furlongi, named by Welles in 1943. Aphrosaurus furlongi was discovered in the Panoche Hills of Fresno County, California in 1939 by rancher Frank C. Piava and named after University of California Berkeley field assistant and specimen preparator Eustace Furlong. Plesiosaurs (sensu Plesiosauroidea) appeared at the end of the Triassic Period and thrived until the K-T extinction, at the end of the Cretaceous Period. While they were Mesozoic diapsid reptiles that lived at the same time as dinosaurs, they were not dinosaurs. Gastroliths are frequently found associated with plesiosaurs.