Tritonia newfoundlandica is a species of dendronotid nudibranch. It is a marine gastropod mollusc in the family Tritoniidae.MolluscaBase eds. (2020). MolluscaBase. Tritonia newfoundlandica Valdés, Murillo, McCarthy & Yedinak, 2017. Accessed on 2021-01-11.

Distribution This species was found off Flemish Cap, west of Newfoundland at 538–492 m depth, .

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