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Marks, J. A. (1996). Three sibling species of didemnid ascidians from northern Norway: Didemnum albidum (Verrill, 1871), Didemnum polare (Hartmeyer, 1903), and Didemnum romssae sp. nov. Can. J. Zool., 74 (2): 357-379.
Marks, J. A. (1996). Three sibling species of didemnid ascidians from northern Norway: Didemnum albidum (Verrill, 1871), Didemnum polare (Hartmeyer, 1903), and Didemnum romssae sp. nov. Can. J. Zool., 74 (2): 357-379.
