Turbellarian taxonomic database
Acoela Haploposthiidae Diagnosis
Westblad E 1948 (citation); see also Dörjes (citation) - Acoels with simple copulatory organs. In most cases this organ consists of a tube-shaped male antrum and a spherical seminal vesicle. Either the antrum or the seminal vesicle or both can be absent. Penis is lacking [but Haploposthia albiventer Marcus and H. rubra (An der Lan) have a very small penis papilla]. Male gonopore terminal, subterminal, or ventral. Mouth ventral.
[From Dorjes J (1968): 94]
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