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Macroplata tenuiceps

Reptilia - Sauropterygia - Rhomaleosauridae

Taxonomy
Macroplata tenuiceps was named by Swinton (1930). Its type specimen is BMNH R5488, a partial skeleton, and it is a 3D body fossil. Its type locality is Harbury Cement Works, Leamington Spa (owned by Greaves, Bull, and Lakin), which is in a Hettangian terrestrial limestone in the Blue Lias Formation of the United Kingdom. It is the type species of Macroplata.

Synonymy list
YearName and author
1930Macroplata tenuiceps Swinton
2001Macroplata tenuiceps O'Keefe p. 13
2010Macroplata tenuiceps Ketchum and Smith p. 1070 figs. 1-7

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
RankNameAuthor
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
orderSauropterygia
Pistosauria(Baur 1890)
Plesiosauria(de Blainville 1835)
familyRhomaleosauridaeNopcsa 1928
genusMacroplataSwinton 1930
speciestenuicepsSwinton 1930

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
Swinton 1930Sauropterygian with a long skull and a long neck tapering from back to front. Cervical vertebrae moderately long, centra broader than high and narrow across the neurapophyses. Articular faces only slightly concave, and the anterior and posterior margins of the centrum rugose. Dorsals smooth and with constricted centra; articular faces not deeply concave; neural spines moderately high; transverse processes wholly supported by the arch. Sacral vertebrae with large rib-facets on the centra, and large and stout ribs. Caudals with rugose anterior and posterior margins to centra, articular faces more deeply cupped than the other vertebrae.
H. F. Ketchum and A. S. Smith 2010A plesiosaurian with the following autapomorphies: posterior convergence of the long axes of the posterior interpterygoid vacuities; triangular emargination in the posterior border of the coracoid; triangular emargination in the posterior border of the ischium.