Turbellarian taxonomic database

Convolutidae Haplodiscus Diagnosis

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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