Discodoris tristis is a species of sea slug, a dorid nudibranch, shell-less marine opisthobranch gastropod mollusks in the family Discodorididae.Gofas, S. (2015). Discodoris tristis Bergh, 1899. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=764606 on 2016-05-11
Distribution Discodoris tristis is found off the coast of Brazil.
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