Hydrocolus is a genus of beetles in the family Dytiscidae, containing the following species:Dytiscidae Species List at Joel Hallan's Biology Catalog. Texas A&M University. Retrieved on 7 May 2012.
Hydrocolus deflatus (Fall, 1923) Hydrocolus filiolus (Fall, 1923) Hydrocolus heggiensis Ciegler, 2001 Hydrocolus oblitoides Roughley & Larson, 2000 Hydrocolus oblitus (Aubé, 1838) Hydrocolus paugus (Fall, 1923) Hydrocolus persimilis (Crotch, 1873) Hydrocolus rubyae (Larson, 1975) Hydrocolus rufiplanulus (Fall, 1923) Hydrocolus rupinus Roughley & Larson, 2000 Hydrocolus sahlbergi Nilsson, 2001 Hydrocolus stagnalis (Gemminger & Harold, 1868)
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