†family Elasmosauridae Cope 1869 (elasmosaur)

Reptilia - Plesiosauria - Elasmosauridae

Synonyms: Cimoliasauridae Delair 1959, Cimoliosauridae Delair 1959

Parent taxon: Plesiosauroidea according to J. P. O'Gorman and R. A. Otero 2023

See also Andrews 1910, Antunes 1964, Araújo et al. 2015, Araujo et al. 2015, Bardet et al. 2015, Benson and Druckenmiller 2014, Brown 1981, Cabrera 1941, Carpenter 1999, Carroll 1988, Cope 1871, Cope 1875, Delair 1960, Druckenmiller and Russell 2006, Fostowicz-Frelik and Gazdzicki 2001, Gasparini et al. 2003, Gasparini et al. 2001, Gasparini and Salgado 2000, Gasparini et al. 2007, Gasparini and Spalletti 1993, Gasparini et al. 2015, Hay 1902, Hay 1930, Hiller and Mannering 2004, Hiller et al. 2005, Hiller and Mannering 2005, Hiller et al. 2014, Hiller et al. 2017, Ketchum and Benson 2010, Ketchum and Benson 2011, Kuhn 1946, Kuhn 1966, Lazo and Cichowolski 2003, Martin and Crame 2006, Martinelli and Forasiepi 2004, Marx et al. 2021, Mateus et al. 2012, Miller et al. 2020, Moyano-Paz et al. 2022, Nicholls and Meckert 2002, O'Gorman 2012, O'Gorman 2015, O'Gorman 2016, O'Gorman 2016, O'Gorman 2016, O'Gorman 2016, O'Gorman 2019, O'Gorman 2020, O'Gorman 2021, O'Gorman et al. 2021, O'Gorman et al. 2023, O'Gorman and Coria 2017, O'Gorman et al. 2018, O'Gorman et al. 2013, O'Gorman et al. 2014, O'Gorman et al. 2015, O'Gorman et al. 2014, O'Gorman et al. 2017, O'Gorman et al. 2021, O'Gorman et al. 2018, O'Gorman et al. 2011, O'Gorman et al. 2013, O'Gorman et al. 2015, O'Gorman et al. 2019, O'Gorman et al. 2016, O'Gorman and Varela 2010, O'Keefe 2001, O'Keefe 2004, O'Keefe et al. 2017, O'Keefe and Street 2009, Otero 2024, Otero and O'Gorman 2013, Otero et al. 2015, Otero et al. 2016, Otero et al. 2018, Otero et al. 2012, Otero et al. 2013, Otero et al. 2014, Otero et al. 2014, Otero et al. 2015, Otero and Soto-Acuña 2021, Otero et al. 2009, O’Gorman et al. 2020, Páramo-Fonseca et al. 2019, Persson 1963, Previtera and González Riga 2008, Sachs et al. 2017, Sato 2003, Schumacher and Everhart 2005, Seeley 1892, Serratos et al. 2017, Thurmond and Jones 1981, Wegner 1914, Welles 1943, Welles 1949, Welles 1962, Welles and Gregg 1971, White 1940 and Wiffen and Moisley 1986

Sister taxa: Cimoliosaurus limnophilus, Cryptoclidia, Cryptoclididae, Euplesiosauria, Franconiasaurus, Leptocleidia, Microcleididae, Opallionectes, Plesiopharos, Plesiopterys, Plesiosauridae, Plesiosaurus, Polycotylidae, Sthenarosaurus, Westphaliasaurus

Subtaxa: Alexeyisaurus Alzadasaurinae Alzadasaurus kansasensis Alzadasaurus tropicus Brimosaurus Callawayasaurus Callowayosaurus Cardiocorax Chubutinectes Cimoliasaurus Cimoliasaurus andium Cimoliasaurus cantabrigiensis Cimoliasaurus caudalis Elasmosaurus amalitskii Elasmosaurus kurskensis Elasmosaurus orskensis Elasmosaurus serdobensis Elasmosaurus sternbergi Eromangasaurus Euelasmosaurida Fluvionectes Fresnosaurus Gronausaurus Jucha Lagenanectes Leivanectes Leurospondylus Mauisaurus gardneri Plesiosaurus constrictus Plesiosaurus crassicostatus Plesiosaurus gulo Plesiosaurus gurgitis Plesiosaurus helmersenii Plesiosaurus holmesii Plesiosaurus hoodii Plesiosaurus mackayii Plesiosaurus mauritanicus Plesiosaurus sutherlandi Pliosaurus gigas Pliosaurus macrospondylus Scanisaurus Stereosaurus Thalassiosaurus Thalassiosaurus ischiadicus Thalassonomosaurus Thalassonomosaurus nobilis Wapuskanectes Weddellonectia Woolungasaurus Woolungasaurus glendowerensis Zarafasaura

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Type: Elasmosaurus

Ecology: aquatic carnivore

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