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Morrosaurus antarcticus

Reptilia

Taxonomy
Morrosaurus antarcticus was named by Rozadilla et al. (2016). Its type specimen is MACN Pv 19777, a partial skeleton (partial R hind limb), and it is a 3D body fossil. Its type locality is northwest of Fortress Hill, El Morro, which is in a Maastrichtian marginal marine sandstone in the Snow Hill Island Formation of Antarctica.

Synonymy list
YearName and author
2016Morrosaurus antarcticus Cruzado-Caballero et al. p. 146
2016Morrosaurus antarcticus Rozadilla et al. p. 312 fig. 2–6
2018Morrosaurus antarcticus Bell et al. p. 29
2018Morrosaurus antarcticus Herne et al. p. 15
2018Morrosaurus antarcticus Madzia et al. p. 969
2019Morrosaurus antarcticus Herne et al. p. 578
2019Morrosaurus antarcticus Ibiricu et al. p. 286
2020Morrosaurus antarcticus Dieudonné et al.
2020Morrosaurus antarcticus Yang et al. p. 4

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
RankNameAuthor
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Ornithopoda()
—Clypeodonta
—Iguanodontia()
—Elasmaria
genusMorrosaurus
speciesantarcticus

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.

†Morrosaurus antarcticus Rozadilla et al. 2016
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Diagnosis
ReferenceDiagnosis
S. Rozadilla et al. 2016Mid-sized ornithopod diagnosable on the basis of the following combination of characters (autapomorphies marked by an asterisk): 1) femur with lesser trochanter positioned anterolateraly to the greater trochanter; 2) in proximal view, femur with the lateral margin of greater trochanter sigmoidal in shape, with transversely thick posterior edge, and a very thin anterior one*; 3) tibia with medial malleolus subtriangular in contour in anterior view and showing a concave anterior surface; and 4) proximal end of metatarsal IV in proximal view, with a thick and very well developed posterior process that medially wraps the metatarsal III*.