Author: (Günther, 1868)
Comments: Occurs in lowland rivers including streams adjacent to the peat areas (Ref. 57235).  Found at the surface in large rivers and lakes.  At high water it moves into the flooded forest.  Usually occurs together with <i>P. oxygastroides</i> and <i>P. williaminae</i>.  Used to make prohac (Ref. 12693).