Genus: Morrosaurus RODZAILLA, AGNOLIN, NOVAS, ARANCIAGA ROLANDO, MOTTA, LIRIO, & ISASI, 2016
Etymology: The generic name Morrosaurus is due to the "El Morro", West Antarctica, Antarctica, the place where the dinosaur reamins were recovered, and Greek, sauros, "lizard."

Species: antarcticus RODZAILLA, AGNOLIN, NOVAS, ARANCIAGA ROLANDO, MOTTA, LIRIO, & ISASI, 2016
Etymology: In reference to the Antarctic continent.

Holotype: MACN Pv 19777

Locality: Lat 63°55'40"S, Long. 57°30'15"W, close to shore, at 10 m above the sea level, NW of Fortress HIll, El Morro (The Naze) Peninsula, James Ross Island, West Antarctica, Antarctica.

Horizon: Cape Lamb Member, Lopez de Bertodano Formation.

Biostratigraphy:

Age: Maastrichtian Stage, Upper Senonian Subepoch, Uppermost Gulf Epoch, Latest Cretaceous.

Material: Fragmentary right hind limb, proximal and distal end of femur, proximal and distal end of the tibia, proximal ends of metatarsal II, III, IV, and proximal end of phalanx I-III.

Referred material:

LAMANNA, CASE, ROBERTS, ARBOUR, ELY, SALISBURY, CLARKE, MALINZAK, WEST & O'CONNOR, 2019

Loclaity: North of Fortress Hill, central part of the northwestern shore of the Naze Peninsula, 63°55'41"S, 57°30'18"W, northern James Ross Island, JRB, AntarcticPeninsula.

Horizon: Cape Lambe Member, Snow Hill Island Formation, Marambio Group.

Biostratigraphy:

Age: Upper Campanian-Lower Maasterichtian Stage, Senonian Subepoch, Late Gulf Epoch, Latest Cretaceous.

Material:

AMNH FARB 30897: Distal end of a ?right pedal phalanx, and 7 associated but unidentified fragments.

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