Haploniscidae Hansen, 1916
Hydroniscus abyssi Hansen, 1916
Hydroniscus buzwilsoni George, 2004
Hydroniscus lobocephalus Lincoln, 1985B
Hydroniscus malyutinae George, 2004
Hydroniscus minutus Birstein, 1971
Hydroniscus ornatus Menzies, 1962C
Hydroniscus quadrifrons Menzies, 1962C
Hydroniscus vandeli Chardy, 1974
Hydroniscus vitjazi Birstein, 1963A
Hydroniscus watlingi George, 2004
