Keupp, 1979b
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Keupp, H., 1979b: Alasphaera caudata n.g. n.sp., eine neue Calciodinelloidee aus der Unterkreide (Hauterivium) Nordwestdeutschlands. Alasphaera caudata n.g. n.sp., a new Calciodinelloidea from the Lower Cretaceous (Hauterivian) of northwest Germany. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, no.5, p.284-290.