Mixosauridae
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Mixosauridae was an early group of ichthyosaurs, living between 247.2 and 235 million years ago, during the Triassic period. Fossils of mixosaurs have been found all over the world: China, Timor, Indonesia, Italy, Germany, Spitsbergen, Switzerland, Svalbard, Canada, Alaska, and Nevada.
Skeleton of Mixosaurus panxianensis, sometimes assigned to its own genus Barracudasauroides
Skeleton of Ichthyosaurus. Historically, mixosaurids were frequently considered ancestral to Ichthyosaurus
Skeleton of Cymbospondylus. Exactly how mixosaurids and Cymbospondylus are related to other ichthyosaurs is uncertain
Skull and front part of the skeleton of Mixosaurus cornalianus
Parvinatator
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Parvinatator, from Latin, “parvus” little and “natator” swimmer, is an extinct genus of small ichthyopterygian marine reptile that lived during the Early to Middle Triassic. Its fossils have been found in British Columbia, Canada.
Grippia longirostris from the early Triassic is a close relative.
Utatsusaurus, another close relative.