Gyratrix hermaphroditus is a species of rhabdocoel flatworm in the family Polycystididae.

[2] The animal is 1 to 1.5 mm long, transparent and colorless.

It possesses a proboscis at the anterior end and a sharply pointed stylet.

[2] Gyratrix hermaphroditus represents a species complex.

[4] Members of the species complex occur in both marine and inland water habitats.