Genus: Mussaurus BONAPARTE & VINCE, 1979
Etymology: Latin, mus, “mouse”, and Greek, sauros, lizard: “Mouse lizard”.

Species: patagonicus BONAPARTE & VINCE, 1979
Etymology: In reference to Patagonia, Argentina.

Holotype: PVL 4068

Locality: Laguna La Colorada, Ea. Canadon Largo, North-central Santa Cruz Province, Patagonia, Argentina.

Horizon: Laguna Colorada Formation, El Tranquilo Group (Upper El Tranquilo Formation), Coloradense superior.

Biostratigraphy:

Age: ?Norian Stage, Middle Late Triassic Epoch, Late Triassic.

Referred material:

POL, MANCUSO, SMITH, MARISCANO, RAMEZANI, CERDA, OTERO & FERNANDEZ, 2021

MPM-PV 1870 (Field number H0): Associated eggs (scattered on surface).

MPM-PV 1871 (Field number H1): 5 eggs on the surface.

MPM-PV 1872 (Field number H2): 1 egg on the surface.

MPM-PV 1873 (Field number H3): 3 complete eggs on the surface.

MPM-PV 1874 (Field number H4): 1 egg on surface.

MPM-PV 1875 (Field number H5): Nest with 30 eggs, 2 complete eggs in concretion (sin situ).

MPM-PV 1876 (Field number H6) 2 eggs.

MPM-PV 1877 (Field number H7): Fragments of eggshells.

MPM-PV 1878 (Field number H8): Nest of 21 eggs.

MPM-PV 1879 (Field number H9): Eggs with associated small bones encluding a right dentary of an embryo.

MPM-PV 1880 (Field number H10): Eggs and eggshell fragments with associated small bones.

MPM-PV 1881 (Field number H11): Fragments of eggshells.

MPM-PV 1882 (Field number H12): 2 eggs in concretion (in situ).

MPM-PV 1883 (Field number H13): Fragments of 2 eggs and scattered egghsells associated with a caudal vertebra.

MPM-PV 1884 (Field number H14): Fragments of 2 eggs and scattered eggshells.

MPM-PV 1885 (Field number H15): Fragments of eggs and scattered eggshells.

MPM-PV 1886 (Field number H16): 2 eggs.

MPM-PV 1887 (Field number H17): Nest with 30 eggs.

MPM-PV 1888 (Field number H18): Fragments of eggshells.

MPM-PV 1889 (Field number H19): Isolated egg.

MPM-PV 1890 (Field number H20): Isolated egg.

MPM-PV 1891 (Field number H21): Nest with eggs with embryonic remains.

MPM-PV 1892 (Field number H22): 3 eggs in concretion.

MPM-PV 1893 (Field number H23): 3 eggs on surface.

MPM-PV 1894 (Field number H24): Isolated egg.

MPM-PV 1895 (Field number H25): Fragments of eggs.

MPM-PV 1896 (Field number H26): Nest with at least 14 eggs.

MPM-PV 1897 (Field number H27): 3 eggs in concretion.

MPM-PV 1898 (Field number H28): 2 isolated eggs.

MPM-PV 1899 (Field number H29): Isolated egg.

MPM-PV 1900 (Field number H30): Nest with at least 8 eggs.