Rachitrema

The type species is R. pellati, described by Sauvage in 1883. When first described, Sauvage classified it as a dinosaur.^[1] Later, Franz Nopcsa referred the genus to Anchisauridae, while Karl Alfred von Zittel referred it to either Zanclodontidae or Megalosauridae.^[2][3][4]

The ichthyosaur nature of Rachitrema was recognized by Friedrich von Huene, who synonymized it with Shastasaurus. Sauvage conceded that Rachitrema was non-dinosaurian,^[5] and the ichthyosaur classification of the genus became universally accepted by several authors.^{[6][7][8][9][10]} McGowan and Motani (2003) considered Rachitrema dinosaurian without comment.^[11] 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.^[12]

• Dinosaur Mailing List entry, which discusses the genus

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