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Stock, J.H. & S. van der Spoel. (1976). Pteroxena papillifera n. gen., n. sp., an endoparasitic organism (Copepoda ?) from the gymnosomatous pteropod, Notobranchaea. Bulletin Zoölogisch Museum, Universiteit van Amsterdam 5(21):177-180, figs. 1-2. (10-xii-1976)