Capellinia steinbecki is a species of sea slug or nudibranch, a marine gastropod mollusc in the family Eubranchidae.Bouchet, P. (2025). Capellinia steinbecki Behrens, 1987. In: MolluscaBase (2026). Accessed through: World Register of Marine Species on 2026-04-18.
Distribution This species was described from specimens collected from boat floats at Dana Landing, Mission Bay, San Diego, and intertidally at Malibu, , California, United States. It has been reported from Palos Verdes south to La Paz, Baja California Sur, Mexico.Behrens, D. W., & Hermosillo, A. (2005) Eastern Pacific nudibranchs, a guide to the opisthobranchs from Alaska to Central America. vi + 137 pp., 314 photos. Sea Challengers, Monterey, California, page 110.
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