Pachydrus 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.
Pachydrus brevis Sharp, 1882 Pachydrus cayennensis (Laporte, 1835) Pachydrus cribratus Sharp, 1882 Pachydrus globosus (Aubé, 1838) Pachydrus obesus Sharp, 1882 Pachydrus obniger (Chevrolat, 1863) Pachydrus politus Sharp, 1882 Pachydrus princeps (Blatchley, 1914) Pachydrus ritsemae Régimbart, 1883
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