Distribution: Florida, Cuba, Curaçao, Guadaloupe, St. Martin, Panama, Colombia, Brazil, Mozambique, Yemen. Characteristics: Small styelid, with delicate musculature in the body wall, four folds in each side of the branchial sac, a typhlosole plug visible in the aperture of the anus and only one large endocarp enclosed between the stomach and intestine. The ovary is surrounded by testis.