Oogenus: Parvoolithus MIKHAILOV, 1996
Etymology: Latin, parvus, “small” and Greek, oo, "egg" and Greek, lithus, "rock or stone."

Oospecies: tortuosus MIKHAILOV, 1996
Etymology: Latin , tortusosus, “difficult, incomprehensible.”

Holotype: PIN 4479-1

Locality: Khongil Locality, Ömnögov, Mongolia

Horizon: ?Barun Goyot Formation.

Biostratigraphy:

Age: Middle –Late Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous..

Material: A compress egg encrusted with particles of matrix.