Descriptive and distributional inform .ation is presented on three Indochinese-Thai clupeid species referrable to the subfamily Pellonulinae: Clupeoides borneensis, Corica soborna and Clupeichthys goniognathus.Clupeoides borneensis and Corica soborna show a close affinity, and are distinctive from Clupeichthys goniognathus, most remarkably in the jaw structure and the manner of opening the mouth.In the study area, Corica soborna is apparently confined in estuarine freshwaters;Clupeoides borneensis occurs a little further upstream in the Mekong;Clupeichthys goniognathus has a wide range in the Mekong as far upstream as central Laos.