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context source (PeRMS)Ramírez, R.; Paredes, C.; Arenas, J. (2003). Moluscos del Perú. <em>Revista de Biologia Tropical.</em> 51(supplement 3): 225-284.[details] Available for editors [request]
additional sourceWillan, R. C. & Burn, R. (2003). On the publication date, authorship, and type species of <i>Umbraculum</i> and <i>Tylodina</i> (Gastropoda: Opisthobranchia: Tylodinoidea): a rejoinder. <em>The Nautilus.</em> 117 (1): 23-29., available online athttp://biodiversitylibrary.org/page/8525333[details]