†subfamily Styxosaurinae Otero 2016 (elasmosaur)

Reptilia - Sauropterygia - Elasmosauridae

Phylogenetic definition - The Styxosaurinae includes the genera Terminonatator, Styxosaurus ('Hydralmosaurus', below) Albertonectes, Elasmosaurus, their most recent ancestor and all descendants.

Full reference: R. A. Otero. 2016. Taxonomic reassessment of Hydralmosaurus as Styxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous. PeerJ 4:e1777:1-60

Parent taxon: Elasmosauridae according to R. A. Otero 2016

See also Serratos et al. 2017

Sister taxa: Alexeyisaurus, Alzadasaurinae, Alzadasaurus kansasensis, Alzadasaurus tropicus, Aristonectinae, Callawayasaurus, Callowayosaurus, Cardiocorax, Cimoliasaurus, Cimoliasaurus andium, Cimoliasaurus cantabrigiensis, Cimoliasaurus caudalis, Elasmosaurinae, Elasmosaurus amalitskii, Elasmosaurus kurskensis, Elasmosaurus orskensis, Elasmosaurus serdobensis, Elasmosaurus sternbergi, Eromangasaurus, Gronausaurus, Hydrotherosaurus, Kawanectes, Leurospondylus, Libonectes, Mauisaurus, 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, Thalassomedon, Thalassonomosaurus, Thalassonomosaurus nobilis, Tuarangisaurus, Vegasaurus, Wapuskanectes, Weddellonectia, Woolungasaurus, Woolungasaurus glendowerensis, Zarafasaura, Brimosaurus, Morturneria

Subtaxa: Albertonectes Elasmosaurus Nakonanectes Styxosaurus Terminonatator

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Ecology: aquatic carnivore

Distribution:

• Cretaceous of Canada (2: Alberta, Saskatchewan collections), Japan (7), Sweden (1), United States (11: Kansas, Montana, Nebraska, South Dakota, Wyoming)

Total: 21 collections each including a single occurrence

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