Cystoopsidae

{{short description|Family of roundworms}}

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Cystoopsidae is a family of nematodes belonging to the order Trichocephalida.{{cite web|title=Cystoopsidae|url=https://www.gbif.org/species/6494|website=www.gbif.org|access-date=7 June 2021|language=en}}

Genera:

• Cystoopsis Wagner, 1867
• Dioctowittus Chabaud & Hoa, 1960