Ichthyosaurs were marine reptiles living 145 million years ago, mainly during the Early Jurassic period. It is named 'fish lizard' in Greek by Henry De la Neche and William Conybeare. It was first discovered in the early 19th century by Mary Anning in England. The name for the marine reptiles group, ichthyosaurs, was first put to use by Charles Konig in 1818. Almost all fossil ichthyosaurs during the 19th century were attributed to the Ichthyosaurus marine reptile, due to which the genus had 50 species by 1900. These species were subsequently moved to separate genera and used interchangeably with other species. They were built for speed and paddled with their tails, fins, and short fingers. They were predators from the Ichthyosauria group animals that breathed air without gills.