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Eustreptospondylus oxoniensis

Reptilia - Megalosauridae

Taxonomy
Eustreptospondylus oxoniensis was named by Walker (1964). Its type specimen is OUM J13558, a partial skeleton, and it is a 3D body fossil. Its type locality is Summertown Pit, Wolvercote (OUM), which is in a Callovian marine claystone in the Oxford Clay Formation of the United Kingdom. It is the type species of Eustreptospondylus.

It was recombined as Magnosaurus oxoniensis by Rauhut (2003) and Naish and Martill (2007).

Synonymy list
YearName and author
1964Eustreptospondylus oxoniensis Walker p. 124
1969Eustreptospondylus oxoniensis Colbert and Russell p. 36
1970Eustreptospondylus oxoniensis Osmólska and Roniewicz p. 18
1970Eustreptospondylus oxoniensis Steel p. 32
1974Eustreptospondylus oxoniensis Molnar p. 1011
1984Eustreptospondylus oxoniensis Welles pp. 163-165
1988Eustreptospondylus oxoniensis Martill p. 186
1988Eustreptospondylus oxoniensis Paul p. 287
1990Eustreptospondylus oxoniensis Molnar et al. p. 191
1991Eustreptospondylus oxoniensis Molnar p. 167
1992Eustreptospondylus oxoniensis Bakker et al. p. 3
1995Eustreptospondylus oxoniensis Buffetaut et al. p. 70
1996Eustreptospondylus oxoniensis Molnar et al. p. 671
1997Eustreptospondylus oxoniensis Buffetaut p. 213
1997Eustreptospondylus oxoniensis Novas p. 681
1997Eustreptospondylus oxoniensis Smith p. 510
1999Eustreptospondylus oxoniensis Knoll et al. p. 104
2003Magnosaurus oxoniensis Rauhut p. 20
2004Eustreptospondylus oxoniensis Holtz, Jr. et al. p. 72
2004Eustreptospondylus oxoniensis Sadleir et al. p. 107A
2007Magnosaurus oxoniensis Naish and Martill p. 501
2007Eustreptospondylus oxoniensis Sampson and Witmer p. 38
2008Eustreptospondylus oxoniensis Sadleir et al. pp. 7-8 figs. 3-25; Pl. 1-20
2012Eustreptospondylus oxoniensis Carrano et al. pp. 231-232

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
Orionides
superfamilyMegalosauroidea()
familyMegalosauridae()
genusEustreptospondylus
speciesoxoniensis

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. Sadleir et al. 2008A spinosauroid theropod that can be distinguished from other basal tetanurans on the basis of the following autapomorphies: presence of a shallow lachrymal fenestra that incorporates a second smaller foramen; squamosal with a hypertrophied ventral flange that overhangs the infratemporal fenestra in lateral view, partially obscuring its posterodorsal corner (Rauhut 2003); absence of ventral midline keels from the centra of cervical, cervicodorsal and dorsal vertebrae; and presence of a marked depression on the anterior part of the ventral surface of cervical vertebra 10. In addition, Eustreptospondylus can be distinguished from all other spinosauroids on the basis of the following feature: presence of an excavation along the posterior surface of the ventral process of the postorbital, creating a shallow fossa that surrounds the anterior margin of the infratemporal fenestra.
M. T. Carrano et al. 2012Megalosauroid theropod with: (1) shallow lacrimal fenestra incorporating second, smaller foramen (Sadleir et al. 2008); (2) squamosal with hypertrophied ventrolateral flange obscuring posterodorsal corner of lower temporal fenestra in lateral view (Rauhut 2003); (3) absence of ventral midline ridge on posterior cervical and anterior dorsal vertebral centra (Sadleir et al. 2008); (4) marked depression located anteriorly on ventral surface of tenth presacral vertebra (Sadleir et al. 2008); (5) lateral wall of iliac brevis fossa nearly horizontal, exposing medial wall of fossa along entire length in lateral view; and (6) pubic peduncle of ilium as broad anteroposteriorly as mediolaterally (modified from Benson 2009a).