Tritoniella gnathodentata is a species of the nudibranch genus Tritoniella.
Distribution It is found in the waters off of South Georgia and Shag Rocks in the northern parts of the Scotia Arc at depths between and .
Ecology Its diet consists of the gorgonian soft coral belonging to the family Primnoidae.
Etymology The species name stems from the diagnostic character of dentition on the masticatory border of the jaws.
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