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DescriptionA tiny aeolid with single cerata arranged alternately along the sides of the body. The body is translucent white with red markings on the sides of the head and just behind the rhinophore bases. The digestive gland is grey in colour, and shows through the back as a branching vessel. The cerata are swollen in shape, and have large white cnidosacs at the tips. The oral tentacles are short but the rhinophores are long and tapering. Only 6-8mm in length when fully grown. Eubranchus exiguus is often found with Tergipes tergipes, and is equally small. It may easily be distinguished with a hand lens or low-power microscope by the more numerous cerata and dark rings on the rhinophores.