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

Oospecies: oblongum MONES, 1980
Etymology: Latin, oblongum, "oblong, elongate."

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.