Elasmosauridae is an extinct family of plesiosaurs, often called elasmosaurs. They had the longest necks of the plesiosaurs and existed from the Hauterivian to the Maastrichtian stages of the Cretaceous, and represented one of the two groups of plesiosaurs present at the end of the Cretaceous alongside Polycotylidae.
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^O'Gorman, José P.; Coria, Rodolfo A. (2016-09-21). "A new elasmosaurid specimen from the upper Maastrichtian of Antarctica: new evidence of a monophyletic group of Weddellian elasmosaurids". Alcheringa: An Australasian Journal of Palaeontology. 41 (2): 240–249. Bibcode:2017Alch...41..240O. doi:10.1080/03115518.2016.1224318. hdl:11336/79006. ISSN0311-5518.
^ O'Gorman, José P.; Carignano, Ana Paula; Calvo-Marcilese, Lydia; Pérez Panera, Juan Pablo (2023-08-10). "A new elasmosaurid (Sauropterygia, Plesiosauria) from the upper levels of the La Colonia Formation (upper Maastrichtian), Chubut Province, Argentina". Cretaceous Research. 152: 105674. Bibcode:2023CrRes.15205674O. doi:10.1016/j.cretres.2023.105674. ISSN0195-6671.