†Aristonectes Cabrera, 1941 †Turneria Chatterjee & Small, 1989 (preoccupied) †Morturneria Chatterjee & Creisler, 1994 †Aristonectes parvidens Cabrera, 1941 †Turneria seymourensis Chatterjee & Small, 1989 (preoccupied) †Morturneria seymourensis (Chatterjee & Small, 1989) Chatterjee & Creisler, 1994
In his phylogenetic analysis of plesiosaurs, O'Keefe (2001) did not treat Aristonectes Cabrera, 1941. He mentions it in passing, stating that it is very similar to Antarctic genus Morturneria Chatterjee & Creisler, 1994. Based on his analysis O'Keefe places Morturneria to a rather obscure basal cryptoclidoid family "Cimoliasauridae" Delair, 1959. "Cimoliasauridae" in itself is of doubtful validy, since it is based on a invalid genus Cimoliasaurus Leidy, 1851
In a more recent paper by Gasparini et al. (2003) Aristonectes is treated as a Elasmosaurid genus. They also classify Morturneria as a junior synonym of Aristonectes.
Gasparini, Z., Bardet, N., Martin, J. E. & Fernández, M. S., 2003: The elasmosaurid plesiosaur Aristonectes Cabreta from the Latest Cretaceous of South America and Antarctica.
–Journal of Vertebrate Paleontology: Vol. 23, #1, pp. 104-115
O'Keefe, F. R., 2001: A cladistic analysis and taxonomic revision of the Plesiosauria (Reptilia: Sauropterygia).
–Acta Zoologica Fennica: Vol. #213, pp. 1-63