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Rachitrema
''Rachitrema'' is a poorly known genus of ichthyosaur from the Triassic of France. Its remains were found in France by two independent collectors, towards the end of the nineteenth century. They were only isolated bone fragments.
==Classification==
The type species is ''R. pellati'', described by Sauvage in 1883. When first described, Sauvage classified it as a dinosaur.〔H.-E. Sauvage. 1883. Recherches sur les reptiles trouvés dans l'étage rhétien des environs d'Autun (on the reptiles found in the Rhaetian stage of the environs of Autun ). Annales des Sciences Géologiques 14(3):1-44〕 Later, Franz Nopcsa referred the genus to Anchisauridae, while Karl Alfred von Zittel referred it to either Zanclodontidae or Megalosauridae.〔Zittel, 1890. Handbuch der Palaeontologie. Volume III. Vertebrata (Pisces, Amphibia, Reptilia, Aves). 900 pp.〕〔Zittel, 1895. Grundzüge der Palaeontologie (Palaeozoologie). 971 pp.〕〔Nopcsa, 1901. Synopsis und Abstammung der Dinosaurier. Földtani Közlöny. 31, 247-288.〕
The ichthyosaur nature of ''Rachitrema'' was recognized by Friedrich von Huene, who synonymized it with ''Shastasaurus''. Sauvage conceded that ''Rachitrema'' was non-dinosaurian,〔Sauvage, 1903. Note sur les reptiles de letage Rhetien des environs d'Autun. Bulletin Societe d'Histoire Naturelle d'Autun (France). 16, 309-318.〕 and the ichthyosaur classification of the genus became universally accepted by several authors.〔Merriam, 1908. Triassic Ichthyosauria: With special reference to the American forms. 196 pp.〕〔Huene, 1922. Die Ichthyosaurier des Lias und ihre Zusammenhänge. Jahresversammlung der palaeontologischen Gesellschaft. Verlag Bornträger, Berlin. 114 pp.〕〔Huene, 1951. Eine neue Ichthyosaurier-Gattung der mitteleren Trias. Neues Jahrbuch fur Geologie und Palaontologie, Abhandlungen. 94, 80-92.〕〔Romer, 1976. Osteology of the Reptiles. University of Chicago Press. 772 pp.〕〔Bardet and Cuny, 1993. Triassic reptile faunas from France. Paleontologia Lombarda. 2, 9-17.〕 McGowan and Motani (2003) considered ''Rachitrema'' dinosaurian without comment.〔McGowan and Motani, 2003. Handbook of Paleoherpetology: Ichthyopterygia, Part 8. 175 pp.〕 However, recent re-examination of the type material of ''Rachitrema'' reaffirms the ichthyosaurian classification of the genus, with most of the original remains referable to Ichthyosauria, and the rest being indeterminate beyond Reptilia.〔http://www.academia.edu/4334787/Fischer_V_and_Goolaerts_S._2013._Shastasaurid_ichthyosaurs_and_other_lost_critters_from_the_French_Rhaetian〕
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