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Microcleidus

Reptilia - Sauropterygia - Microcleididae

Synonyms
Synonymy list
YearName and author
1909Microcleidus Watson
1940Microcleidus White p. 461
1963Microcleidus Persson pp. 19-20
1999Occitanosaurus Bardet et al.
1999Microcleidus Carpenter p. 168 fig. 15
2001Microcleidus O'Keefe p. 19 fig. 20
2002Microcleidus Sepkoski, Jr.
2010Microcleidus Ketchum and Benson p. 15
2010Occitanosaurus Ketchum and Benson p. 15
2012Microcleidus Benson et al. fig. 4
2012Occitanosaurus Otero et al.
2013Microcleidus Brown et al.
2014Microcleidus Benson and Druckenmiller figs. 2-3

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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)
superfamilyPlesiosauroideaWelles 1943
familyMicrocleididae
genusMicrocleidus

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
D. M. S. Watson 1909The main characters are (1) elongation of the centra of the cervicals; (2) the narrowness of the cervicals across the zygapophyses, and the fore and aft direction of the latter; (3) the constricted centra of the dorsal region; (4)the great height of the neural spines of the dorsals; (5) the lowness of the centra of the three sacral vertebrae and the great strength of their zygapophyses; (6) the fact that the caudals retain a long rib tihtly fused on down to the end of the tail, showing that there can only have been a very small fin, if any.
R. B. J. Benson et al. 2012Microcleidid plesiosauroids with (selected unambiguous synapomorphies): jugal excluded from orbit margin by maxilla-postorbital contact (character 32.1 in the Phylogenetic analysis; below); jugal short, terminates around posterior orbital margin (33.1); cervical centra longer anteroposteriorly than high dorsoventrally (116.1); longitudinal ridge on lateral surface of cervical centrum (118.1); anteroposterior constriction at base of dorsal neural spines (142.1; also present in Hauffiosaurus and some rhomaleosaurids); anterior process of coracoid long and transversely narrow (165.1; also present in cryptoclidids and leptocleidians)