Family Hydrovolziidae
 
Acherontacarus (Acherontacarellus) Lundblad, 1962
 
  Acherontacarus (Acherontacarellus) cicolanii Bader, 1983 (Sa)
 
Hydrovolzia Thor, 1905
 
  Hydrovolzia cancellata Walter, 1906 (N, Si)
  Hydrovolzia placophora (Monti, 1905) (N, S, Si, Sa)

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