Tenellia giarannae is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Fionidae.[1]
This species was described from the sewage outfall, McMurdo Sound, Ross Sea, Antarctica -77.8589°N 166.6799°W. It is also reported from Arrival Heights, McMurdo Sound, Ross Sea, Antarctica, -77.8373°N 166.6331°W.