Polycystis naegelii
- kingdom: Animalia
- phylum: Platyhelminthes
- class: Rhabditophora
- order: Rhabdocoela
- family: Polycystididae
- genus: Polycystis
- species: Polycystis naegelii
- France
Lysekil
Västra Götaland
Sweden
Polycystis naegelii
Lysekil