Oogenus: Ageroolithus VIANEY-LIAUD & LOPEZ-MARTINEZ, 1997
Etymology: In reference to the Ager Basin, Lleida Province, Spain and Greek, oo, "egg" and Greek, lithus, "rock or stone."

Oospecies: fontllongensis VIANEY-LIAUD & LOPEZ-MARTINEZ, 1997
Etymology: In reference to Fontllonga, Lleida Province, Spain; where the eggshells were found.

Holotype: FLL6-1

Locality: Fontllonga 6, Tremp Basin, Southern Pyrenees, Lleida Province, Spain.

Horizon: Tremp Formation

Biostratigraphy:

Age: Maastrichtian Stage, Uppermost Senonian, Uppermost Gulf Epoch, Late Cretaceous.

Material: Eggshell fragment.

Referred material:

FLL6-1 to 6: 9 eggshell fragments.