Marionia bathycarolinensis is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Tritoniidae.MolluscaBase (2018). Marionia bathycarolinensis V. G. Smith & Gosliner, 2005. Accessed on 2021-01-09.
Distribution This species was described from two specimens collected in deep water (191–223 m) by a submarine at Mutremdiu 3, Palau, Caroline Islands, .
Ecology Analysis of the stomach contents suggests that this species feeds on a species of the octocoral Paracis Kükenthal, 1919, Family Plexauridae Gray, 1859.
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