Marionia arborescens is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Tritoniidae.MolluscaBase (2019). MolluscaBase. Marionia arborescens Bergh, 1890. Accessed on 2021-01-11.
Distribution This species was described from Ambon Island, Indonesia. It has been reported from the Philippines.Behrens, D & Warren, L., 2016. Marionia arborescens. The Slug Site, ed. Miller, M., accessed 2021-01-11.
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