Oogenus: Parvoolithus MIKHAILOV, 1996
Etymology: Latin, parvus, “small”, and oolithus (root of generic names of fossil eggs).

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.