Genus: Macrocephalosaurus TUPI-CALDAS, 1933 non GILMORE, 1943
Etymology: Latin, macro, "big, long," Greek, kephale, "head" and Greek, sauros, "lizard."
Species: mariensis TUPI-CALDAS, 1933
Etymology:
= Hyperodapedon mariensis (TUPI-CALDAS, 1933)
Holotype: MCN 1867
Locality: Near the town of Santa Maria, Rio Grande Do Sul State State, Brazil.
Horizon: Upper Santa Maria Member, Santa Maria Formation.
Biostratigraphy:
Age: Ladinian Stage, Upper Mid Triassic Epoch, Middle Triassic.
Material: Skull and nearly complete skeleton.
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