The rare clariid catfish genus Encheloclarias is recorded for the first time from the peat swamp habitat in Brunei Darussalam, representing its northernmost record on the island of Borneo. Upon detailed examination, the Brunei species is keyed out to E. baculum. Using fresh material from Brunei and Sarawak (Malaysia, Borneo), the taxonomic status of E. prolatus is reviewed, and is herein synonymised with E. baculum, as first reviser's action. An updated key for all Encheloclarias species is provided, and ecological notes on the Brunei material discussed.
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