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This timeline of ichthyosaur research is a chronological listing of events in the history of paleontology focused on the ichthyosaurs, a group of secondarily aquatic marine reptiles whose body plan is convergent with the body plans of dolphins, sharks, and swordfish. Scientists have documented ichthyosaur fossils at least as far back as the late . At that time, a scholar named Edward Lhwyd published a book on British fossils that misattributed some ichthyosaur vertebrae to actual fishes;〔 their true nature was not recognized until the . In 1811, a boy named Joseph Anning discovered the first ichthyosaur fossils that would come to be scientifically recognized as such.〔 His sister Mary would later find the rest of its skeleton and would go on to become a respected fossil collector in her own right.〔 Early researchers recognized ichthyosaurs as marine reptiles, but major aspects of their anatomy and behavior needed to be resolved. They were frequently portrayed as leaving the water to bask on rocks and with straight tails.〔 Although a bend in ichthyosaurs' tail vertebrae was seen from the earliest specimens, scholars assumed the bend reflected damage incurred to the animal's carcass after death. This bend was so common, however, that scholars eventually realized that it was natural and supported a shark-like tail fin.〔 Scientists came to realize that ichthyosaurs were too adapted to leave the water even to lay eggs. Evidence for live birth in ichthyosaurs dates back as far as 1846, when Chaning Pierce reported an apparent fossil ''Ichthyosaurus'' embryo to Sir Richard Owen.〔 Ichthyosaur discoveries continued to be made into the . In 1928, Simeon Muller discovered the remains of 40 gigantic ichthyosaurs in Nevada. However, these remains would not be excavated until Charles Camp and Samuel Welles of Berkeley led an expedition for the purpose in the mid .〔 These fossils would take more than a decade to excavate, and the results of Camp's examination of the bones would not be published until a year after his 1975 death. These giant ichthyosaurs were named ''Shonisaurus popularis'' and their final resting place is now known as Berlin-Ichthyosaur state park.〔 Other notable late 20th century advances in ichthyosaur research include the recognition of a new genus of ichthyosaur called ''Eurhinosaurus longirostris'' that had been misclassified as a species of ''Ichthyosaurus'' since 1854.〔 In 1986 Christopher McGowan would describe another, similar animal serendipitously discovered in England as ''Excalibosaurus'', after King Arthur's mythical sword.〔 The late and early would see scholarly debate regarding the cause of the ichthyosaurs' extinction, especially regarding the potential role played by competition with the mosasaurs which had evolved around the time.〔 ==17th century== 1699 * Edward Lhwyd published a book called Lithophylacii Britannici Ichonographia about British fossils housed in Oxford's Ashmolean Museum. The book contained illustrations of unrecognized ichthyosaur vertebrae misidentified as belonging to fishes. 120 copies of the book were produced.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timeline of ichthyosaur research」の詳細全文を読む スポンサード リンク
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