Huene (1927) assigned ""Ornithopsis" greppini", which he had named in 1922, to the genus "Cetiosauriscus". The known material, discovered in Late Jurassic (Kimmeridgian) deposits in the Reuchenette Formation of Switzerland, includes dorsal and caudal vertebrae, forelimb bones, and a hindlimb and partial pes, from at least two individuals. The long humerus was built like "Cetiosauriscus stewarti" ("C. leedsi" of von Huene's 1927 usage), and the two species were originally distinguished from "Cetiosaurus" by having shorter dorsal vertebrae, a shorter forelimb, and a longer lower leg. Similarities such as the anatomy of the caudal vertebrae were suggested by Christian Meyer and Basil Thüring in 2003 to support the referral of "greppini" to "Cetiosauriscus". However, Weishampel et al. (2004) and Whitlock (2011) considered ""Cetiosauriscus" greppini" to be Eusauropoda "incertae sedis", while Hofer (2005) and Schwarz et al. (2007) concluded that ""Cetiosauriscus" greppini" represents an unnamed genus of basal eusauropod. ""Ornithopsis" greppini" was finally named as the new genus "Amanzia" in 2020.