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Hastanectes valdensis

Reptilia - Sauropterygia - Leptocleididae

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).

Synonymy list
YearName and author
1889Cimoliasaurus valdensis Lydekker p. 188 fig. 61
1889Cimoliosaurus valdensis Lydekker p. 188 fig. 61
1905Plesiosaurus valdensis Koken
2011Cimoliasaurus valdensis Ketchum p. 290 figs. 22.2-22.3
2013Hastanectes valdensis Benson et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
orderSauropterygia
Pistosauria(Baur 1890)
Plesiosauria(de Blainville 1835)
superfamilyPlesiosauroideaWelles 1943
Cryptoclidia
Xenopsaria
Leptocleidia
familyLeptocleididae
genusHastanectes
speciesvaldensis()

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.

Diagnosis
ReferenceDiagnosis
R. B. J. Benson et al. 2013Plesiosaurian 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.