At this point, not much can be said about O. sumatrana on Borneo. Only that a study of our group (Flury et a. 2021) has demonstrated three genetic lineages of Occidozyga from Borneo that were closely related to three such lineages from Sumatra. We therefore conclude that representatives of the "sumatrana"-species group exist on Borneo and put this taxon in our Borneo list as tentative placeholder for the future resolution of the existing taxonomic challenge. We tentatively assign the photographed specimen from the Matang Wildlife Center to this tentative taxon.