Libellago semiopaca is a widespread species in Sundaland. This species can be found in Peninsular Malaysia and Borneo. It is normally found from muddy rivers to clear swift streams. The males always involve in combat. I took some good shots of L. semiopaca during my visit to Lanjak-Entimau Wildlife Sanctuary (LEWS), Sarawak lately. The photos showing below are those taken from LEWS.
