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Sneli, J.-A.; Gulliksen, B. (1975). Ascidia singularis Gunnerus, 1770, and Distomus mamillaris Pallas, 1774: proposed suppression; Polycarpa Heller, 1877 (Tunicata, Ascidiacea) proposed type-species designation under the plenary powers Z.N.(S.) 2088. Bulletin of Zoological Nomenclature. 32 (3): 158-160.
Sneli, J.-A.; Gulliksen, B. (1975). Ascidia singularis Gunnerus, 1770, and Distomus mamillaris Pallas, 1774: proposed suppression; Polycarpa Heller, 1877 (Tunicata, Ascidiacea) proposed type-species designation under the plenary powers Z.N.(S.) 2088. Bulletin of Zoological Nomenclature. 32 (3): 158-160.
