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Euelasmosaurida
Taxonomy
Euelasmosaurida was named by O'Gorman (2019).
It was assigned to Elasmosauridae by O'Gorman (2019), Miller et al. (2020).
It was assigned to Elasmosauridae by O'Gorman (2019), Miller et al. (2020).
Synonymy list
| Year | Name and author |
|---|---|
| 2019 | Euelasmosaurida O'Gorman |
| 2020 | Euelasmosaurida Miller et al. p. 97 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Unr. †Euelasmosaurida O'Gorman 2019
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Unr. †Elasmosaurinae
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G. †Styxosaurus Welles 1943
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†Styxosaurus browni Welles 1952
†Styxosaurus snowii Williston 1890
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Invalid names: Alzadasaurus pembertoni Welles and Bump 1949 [synonym]
Invalid names: Hydralmosaurus Welles 1943 [synonym], Thalassonomosaurus marshii Williston 1906 [nomen dubium]
Invalid names: Styxosaurinae Otero 2016 [synonym]
G. †Libonectes Carpenter 1997 [southwest diver]
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G. †Thalassomedon Welles 1943
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. P. O'Gorman 2019 | Elasmosaurid clade supported by the following synapomorpies: Ch. 5 (0→1), orbit, ventral margin convex; Ch.50 (2→3), sagittal crest high and rising above the cranial table; Ch. 155 (0→1), ventral notch on articular faces of anterior and middle cervical centra; Ch. 202 (1→0), anterolateral margin of scapula (where dorsolateral process meet the ventral ramus) flat or gently convex; and Ch. 255 (1→2), tibia length/width ratio between 0.8 and 1.0. |