Animal to 30 mm. Shell bulloid, covering middle body, partly covered by parapodia. Aperture large, upper part of lip overlapping last whorl. Rhinophores ear-shaped. Eyes prominent behind rhinophores. Neck short, thick. Tail long, slender. Parapodia small, originating from ventral part of animal sides, with small papillae. Body green with whitish-gray spots. Species with planktotrophic development. Lives on and feed on green algae in the genus Caulerpa. The one in the photo (by Ángel Valdés) is crawling atop the Green Feather Alga Caulerpa sertularioides.