Diagnosis
provided by World Register of Marine Species
Head broad, flat, undivided with short flat tentacles. Siphon with two equal or subequal appendages.Operculum absent. Mostly, tubular salivary gland of anterior digestive system very long and easily separated from the racemose salivary gland. Gland of Leiblein large, convoluted and easily separated from the oesophagus. Radula uniserial with tricuspid teeth. Central cusp usually the larger.
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