PhenacostethusPhenacostethus is a genus of fishes in the family Phallostethidae found in freshwater and brackish habitats in southeast Asia.SpeciesThe currently recognized species in this genus are: Phenacostethus posthon T. R. Roberts, 1971 Phenacostethus sikat Parenti, Lumbantobing & Haryono, 2023 Phenacostethus smithi G. S. Myers, 1928 Phenacostethus trewavasae Parenti, 1986