Broad, disk-shaped, planktonic animals, coloration conferred by symbiotic algae, brain insunk, mouth opening in second body-half, partly or completely insunken epidermis, parenchyma weak and strongly spacious-vacuolised. Paired ovaries, copulatory organ consists of musculuous seminal vesicle or a penis sack with invaginated penis-tube.[From Dorjes J (1970): 265]
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