Diagnosis
provided by World Register of Marine Species
Head bilobed with triangular lobes posterior to the eyes. Siphonal appendages unequal with the left longer and flatter, right appendage occasionally absent. Tubular salivary gland of the anterior digestive system usually short and free from the racemose salivary gland. Pattern with spiral lines ending in black nodules on the outer lip. Horny operculum always present.
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- WoRMS Editorial Board
