Turbellarian taxonomic database
Acoela Anaperidae Diagnosis
Convolutida with common gonopore or solely male gonopore, separate male and female gonopore only in Philachoerus johanni. Male and female copulatory organs are highly variable, composite prostatoid organs occur frequently and exclusively in this clade. Body shape is usually convex on the dorsal side and flat on the ventral side.
[From Achatz JG, Hooge MD, Wallberg A, Jondelius U, Tyler S (2010): 29]
Diagnosis for the valid (accepted) taxonomic name
Diagnosis for Aberrantospermata Convolutidae
Spermatozoa with 9+0 axonemes. Pigmentation, algal symbionts and eye spots often present. Male antrum may have numerous stimulatory organs. Sagittocysts may be present. Includes large and active worms
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