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Elasmosauridae (elasmosaur)

Reptilia - Plesiosauria - Elasmosauridae

Taxonomy
Elasmosauridae was named by Cope (1869). Its type is Elasmosaurus. It was considered monophyletic by Gasparini et al. (2001).

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

Subtaxa
Alexeyisaurus, Alzadasaurinae, Alzadasaurus kansasensis, Alzadasaurus tropicus, Brimosaurus, Callawayasaurus, Callowayosaurus, Cardiocorax, Chubutinectes, Cimoliasaurus (syn. Hunosaurus, Iserosaurus), 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