Classification of the subgenus Kozlowskiella (Megakozlowskiella)
G. †Megakozlowskiella Boucot 1957
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†Kozlowskiella (Megakozlowskiella) velata Amsden 1958
†Megakozlowskiella cooperi Gill 1952
†Megakozlowskiella grayi Talent 1963
†Megakozlowskiella magnapleura Johnson 1970
†Megakozlowskiella perlamellosa Hall 1857
†Megakozlowskiella raricosta Conrad 1842
†Megakozlowskiella sculptilis Hall 1843