Deltostethus is a genus of water scavenger beetles in the family Hydrophilidae. There are at least four described species in Deltostethus.

Species These four species belong to the genus Deltostethus: Deltostethus columbiensis (Hatch, 1965) Deltostethus palpalis Sharp, 1882 Deltostethus scitulus Spangler & Huacuja Deltostethus sulcatus Sharp, 1882

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