Oogenus: Ageroolithus VIANEY-LIAUD & LOPEZ-MARTINEZ, 1997
Etymology: In reference to the Ager Basin, and Greek, Oo, 'egg', and Greek, lithus, 'rock or stone'.

Oospecies: fontllongensis VIANEY-LIAUD & LOPEZ-MARTINEZ, 1997
Etymology: In reference to Fontllonga, 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.