Oogenus: Tacuaremborum MONES, 1980
Etymology: Tacuarembo, department of north Central Uruguay, and Latin ovum.

Oospecies: oblongum MONES, 1980
Etymology: oblongum, oblong.

Holotype: M.I.G. s/n,

Locality: Afluente del arroyo Yaguari, Arroyo Cuaro, Tacuarembo Department, Uruguay.

Horizon: Asencio Formation.

Biostratigraphy:

Age: Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Nearly complete egg.