Mosasaurids

Halisaurus is an extinct genus of mosasaur named by Othniel Charles Marsh in 1869. The holotype, consisting of an angular and a basicranium fragment discovered near Hornerstown, New Jersey, already revealed a relatively unique combination of features and prompted a new genus to be described. Its name is a portmanteau of the Ancient Greek ἅλς (háls; "sea") and σαῦρος (saûros; "lizard"). It was renamed by Marsh to Baptosaurus in 1870, since he believed the name to already be preoccupied by the fish Halosaurus. According to modern rules, a difference of a letter is enough and the substitute name

Goronyosaurus is an extinct genus of marine lizard belonging to the mosasaur family. Fossils of Goronyosaurus are exclusively known from the Late Maastrichtian of the Iullemmeden Basin in West Africa, specifically the Dukamaje Formation of Niger and Nigeria and Farin Doutchi Formation of Niger. The type specimen was first described in 1930 as Mosasaurus nigeriensis, but subsequent remains revealed a highly unique set of adaptations that prompted the species to be reclassified as the only species of the new genus Goronyosaurus in 1972. These unique adaptations have made Goronyosaurus notoriousl

Liodon is a dubious genus of mosasaur from the Late Cretaceous, known from fragmentary fossils discovered in St James' Pit, England. Though dubious and of uncertain phylogenetic affinities, Liodon was historically a highly important taxon in mosasaur systematics, being one of the genera on which the family Mosasauridae was based.

Selmasaurus is an extinct genus of marine lizard belonging to the mosasaur family. It is classified as part of the Plioplatecarpinae subfamily alongside genera like Angolasaurus and Platecarpus. Two species are known, S. russelli and S. johnsoni; both are exclusively known from Santonian deposits in the United States.

Ectenosaurus is an extinct genus of marine lizard belonging to the mosasaur family. It is classified as part of the Plioplatecarpinae subfamily alongside genera like Angolasaurus and Platecarpus. Ectenosaurus is known from the Santonian and Campanian of Kansas, Alabama, and Texas.

Igdamanosaurus, meaning "lizard from Igdaman", is an extinct genus of Cretaceous marine lizard belonging to the mosasaur family. It is classified as part of the Globidensini tribe (within the Mosasaurinae), and is like the other members of the tribe recognised by its rounded and knob-like teeth. These teeth indicate a highly specialized lifestyle, likely including a durophagous diet.

Latoplatecarpus is an extinct genus of plioplatecarpine mosasaur known from the Late Cretaceous (early middle Campanian stage) of the northern Gulf of Mexico, the Western Interior Basin of North America, and a singular specimen from the Saratov Region, of Russia. It was among the largest plioplatecarpine mosasaurs, with L. nichollsae measuring over in total body length.

Komensaurus is a genus of basal aigialosaurid mosasauroid from the Late Cretaceous period. It was found at Komen in Slovenia in limestone dating from the Cenomanian. It was earlier referred to as the "Trieste aigialosaur". In 2007, the type species Komensaurus carrolli was named. Its holotype, specimen MCSNT 11430, was discovered in Slovenia and lived alongside the related Carsosaurus.

Gavialimimus is an extinct genus of plioplatecarpine mosasaur from the Maastrichtian of Morocco and possibly Angola.

thumb|left|Restored skeleton thumb|left|Life reconstruction Kourisodon (from the Greek κουρίς kourís + ὀδών odon, "razor tooth") is an extinct genus of mosasaur. Fossils have been found from Vancouver Island in British Columbia, Canada, as well as from the Izumi Group of Japan. These finds date back to the late Santonian stage and the late Campanian to the late Maastrichtian, respectively, of the Late Cretaceous. Kourisodon was originally described as a member of the "Leiodontini", more recently as a "Clidastine".

Haasiasaurus is an extinct genus of early mosasauroid. The genus contains a single species, H. gittelmani, which was found in Cenomanian to Turonian (Upper Cretaceous, about 100 to 93 million years ago) rocks near Ein Yabrud, in the Palestinian West Bank, approximately north of Jerusalem. It was named in honour of the palaeontologist Georg Haas, replacing the original name Haasia which was preoccupied by a millipede. Haasiasaurus was one of the oldest mosasauroids, measuring long. The genus potentially represents a chimera, since the cranial and postcranial material were not found in associati

Amphekepubis is a dubious genus of mosasaur from the Late Cretaceous of Mexico. Its remains correspond to the holotype specimen UM VP 509, which includes a partial skeleton preserved in three dimensions. This specimen comprises the pelvic area, hind limb bones and nine caudal vertebrae. It was found in the east of Monterrey, in the state of Nuevo Leon, within marine sediments (claystones) apparently from the San Felipe Formation, corresponding to the boundary between the Coniacian and Santonian age of the early Late Cretaceous. Amphekepubis is classified under the Mosasaurinae subfamily of mos