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Libonectes morgani

Reptilia - Sauropterygia - Elasmosauridae

Taxonomy
Elasmosaurus morgani was named by Welles (1949). Its type specimen is SMUSMP 69120, a partial skeleton (skull, cervical vertebrae and pectoral girdle), and it is a 3D body fossil. Its type locality is Andy Anderson Farm, near Cedar Hill, which is in a Cenomanian/Turonian marine limestone in the Britton Formation of Texas.

It was recombined as Libonectes morgani by Carpenter (1997), Carpenter (1999) and O'Keefe (2001).

Synonyms
Synonymy list
YearName and author
1949Elasmosaurus morgani Welles pp. 7-24 figs. 1–3 & pls 1-6
1962Elasmosaurus morgani Welles pp. 3 & 56
1997Libonectes morgani Carpenter p. 214
1999Libonectes morgani Carpenter p. 157
2001Libonectes morgani O'Keefe p. 15
2005Libonectes atlasense Buchy pp. 6-17 figs. 1-10

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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
familyElasmosauridaeCope 1869
genusLibonectes
speciesmorgani()

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
S. P. Welles 1949Teeth 9/16; premaxillae extending posteriorly to form anterior part of pineal foramen, where they meet the parietals; nasal flat with rounded outline; prefrontal raised above the level of nasal; pineal foramen very narrow and forward between the orbits; 62 cervical vertebrae (possibly more). Length of skull 42.5 cm; neck, 561.8 cm. Atlas and axis completely fused, with a pronounced ventral spine. Prectrum with a well-devloped median bar; coracoids broadly expanded behind narrow shaft. Distal end of humerus with sharp posterior projection. Large epipodial foramen.