Cadlina affinis is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Cadlinidae.[1]
This species was described from four specimens trawled at McMurdo Sound at the following positions -76.9333°N 176°W, 293 m., -77.7667°N 174°W, 547 m. and off Granite Harbour, entrance to McMurdo Sound, 92 m.