Cryptoclidus is a genus of plesiosaur reptile from the Middle to Late Jurassic period of England, France, Argentina and Cuba.
Sulcusuchus is a genus of polycotylid plesiosaur from the Late Campanian of Argentina.
Picrocleidus is an extinct genus of plesiosaur. It is known only from the type species P. beloclis from the Middle Jurassic Oxford Clay Formation of the United Kingdom.
Leptocleidus is an extinct genus of pliosaurid plesiosaur, belonging to the family Leptocleididae.
Callawayasaurus is a genus of plesiosaur from the family Elasmosauridae. When the first Callawayasaurus fossil was first discovered by Samuel Paul Welles in 1962, it was described as Alzadasaurus colombiensis before being moved into its current genus by Kenneth Carpenter in 1999.
Leurospondylus is a genus of plesiosaur whose family is currently disputed, but is suggested to be Plesiosauridae.
Aristonectes is an extinct genus of plesiosaur from the Late Cretaceous Paso del Sapo Formation of what is now Argentina, the Quiriquina Formation of Chile and the Lopez de Bertodano Formation of Antarctica. The type species is Aristonectes parvidens, first named by Cabrera in 1941.
Vinialesaurus is a genus of plesiosaur from the Late Jurassic (Oxfordian) Jagua Formation of Pinar del Río, Cuba. The type species is Vinialesaurus caroli, first described as Cryptocleidus caroli by De la Torre and Rojas in 1949, and redescribed by Gasparini, Bardet and Iturralde in 2002. The authors of the 2002 paper considered Vinialesaurus distinct enough from Cryptocleidus to warrant its own genus, but it was broadly similar to Cryptocleidus.
Pantosaurus is an extinct genus of plesiosaur from the Late Jurassic (Oxfordian) of what is now Wyoming. It lived in what used to be the Sundance Sea. It was originally named Parasaurus by Othniel Charles Marsh in reference to Plesiosaurus, but that name was preoccupied, and Marsh changed it. The species Muraenosaurus reedii is in fact a junior synonym of Pantosaurus. The holotype YPM 543 is a partial articulated skeleton, partially prepared to yield a distal humerus, four articulated carpals, a fragment of the coracoid, and several isolated cervical vertebrae from the Upper Member of the Sundance Formation. Other material includes USNM 536963, USNM 536965, UW 3, UW 5544 and UW 15938.
Eretmosaurus is an extinct genus of plesiosaur.
Bobosaurus is an extinct genus of sauropterygian reptile related to plesiosaurs. It is based on the holotype MFSN 27285, a partial skeleton found in Early Carnian-age rocks of the Rio del Lago Formation, northeastern Italy. Bobosaurus was named in 2006 by Fabio M. Dalla Vecchia and the type species is B. forojuliensis. It may be a pistosaurid, or closer to Plesiosauria. A recent cladistic analysis found it to be a pistosaur.
Bishanopliosaurus is a genus of plesiosaur. The type species is B. youngi, based on remains found in the Ziliujing Formation of China. It can be differentiated by the bifurcated ribs of its sacrum. Unusually, it appears to be a freshwater plesiosaur. A second species, B. zigongensis, is known from the slightly later Xiashaximiao Formation.
Tatenectes is an extinct genus of cryptoclidid plesiosaur known from the Upper Member of the Sundance Formation of Wyoming. It was named by O'Keefe and Wahl in 2003 and the type species is Tatenectes laramiensis.
Seeleyosaurus is an extinct genus of plesiosaur. It is known from a large almost complete skeleton from the Upper Lias (Toarcian) of Württemberg, Germany. There seems to be the impression of a rhomboidal flap of skin in a vertical plane; if so, many plesiosaurs may have been equipped in this way.
The Guanling Formation is a Mesozoic geologic formation in southwestern China. Plesiosaur remains are among the fossils that have been recovered from its strata.
Alexeyisaurus is an extinct genus of elasmosaurid plesiosaur known from the upper Triassic of Wilczek Formation, Wilczek Land, of Franz Josef Land, Russia. It was first named by A. G. Sennikov and M. S. Arkhangelsky in 2010 and the type species is Alexeyisaurus karnoushenkoi.
Spitrasaurus is an extinct genus of cryptoclidid plesiosauroid plesiosaur known from the uppermost Jurassic of central Spitsbergen, Norway. It is named after a portmanteau of Spitsbergen Travel.
Hastanectes is an extinct genus of a plesiosaurian with possible pliosaurid affinities known from the Early Cretaceous Wadhurst Clay Formation of the United Kingdom. It contains a single species, Hastanectes valdensis, which was originally thought to be a species of Cimoliasaurus.
Vectocleidus is an extinct genus of leptocleidid plesiosaurian known from the Early Cretaceous Vectis Formation of Isle of Wight, in the United Kingdom. It contains a single species, Vectocleidus pastorum.
Leivanectes is a genus of plesiosaurs of the family Elasmosauridae known from Late Aptian marine deposits in central Colombia. It contains a single species, L. bernadoi, which was described in 2019.
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