Marionia elongoreticulata is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Tritoniidae.MolluscaBase (2019). MolluscaBase. Marionia elongoreticulata V. G. Smith & Gosliner, 2007. Accessed on 2021-01-14.

Distribution This species was described from North Najata (Nyata) Island, Banda Sea, , Indonesia with additional specimens from Culebra Island in the Verde Island Passage, Philippines, . It has been reported from Pulau Sangeang, , Indonesia.Anderson, J., 2021. Marionia elongoreticulata. Indonesia nudibranchs and sea slugs, accessed 2021-01-14.

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