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Hastanectes valdensis
Taxonomy
Cimoliasaurus valdensis was named by Lydekker (1889). Its type specimen is BMNH R609, a set of vertebrae (cervical, dorsal and caudal vertebrae), and it is a 3D body fossil. Its type locality is Hastings, unspecified, which is in a Valanginian lacustrine - small horizon in the Wadhurst Clay Formation of the United Kingdom.
It was recombined as Cimoliosaurus valdensis by Lydekker (1889); it was recombined as Plesiosaurus valdensis by Koken (1905); it was considered a nomen vanum by Welles (1962); it was recombined as Hastanectes valdensis by Benson et al. (2013).
It was recombined as Cimoliosaurus valdensis by Lydekker (1889); it was recombined as Plesiosaurus valdensis by Koken (1905); it was considered a nomen vanum by Welles (1962); it was recombined as Hastanectes valdensis by Benson et al. (2013).
Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Cimoliasaurus valdensis Lydekker p. 188 fig. 61 |
| 1889 | Cimoliosaurus valdensis Lydekker p. 188 |
| 1905 | Plesiosaurus valdensis Koken |
| 2011 | Cimoliasaurus valdensis Ketchum p. 290 figs. 22.2-22.3 |
| 2013 | Hastanectes valdensis Benson et al. |
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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.
†Hastanectes valdensis Lydekker 1889
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. B. J. Benson et al. 2013 | Plesiosaurian possessing a possible autapomorphy (ventral ridge of cervical centra pierced by subcentral foramina at midlength, and expands anteriorly to form a triangular platform) and unique character combination explained below (Phylogenetics of other European lowest Cretaceous plesiosaurians): a short neck (c. 20 cervical vertebrae; one or two may be missing), broadly spaced cervical prezygapophyses, cervical centra with a prominent ‘lip’ extending ventrally from the anterior articular surface, a transversely narrow ventral midline ridge on the cervical centra, single-headed rib facets in all cervical vertebrae and a sigmoidal humerus. |