(perk-o-low-moan-ass) is an excavate flagellate - in that it has a ventral groove or gutter that is used in feeding, and is usually classified with the heterolobosea. Two to four flagella insert at the head of the groove, one (the recurrent flagellum) is much longer than the others. Often found in slightly smelly (i.e. anoxic) habitats. Differential interference contrast.