Takano T., Hirano Y.M., Trowbridge C.D., Hirano Y.J. & Watano Y. (2013). Taxonomic Clarification in the Genus Elysia (Gastropoda: Sacoglossa): E. atroviridis and E. setoensis. American Malacological Bulletin. 31(1): 25-37. https://doi.org/10.4003/006.031.0114 3 species