(go-knee-os-toe-um) is a raphidophyte stramenopile. There are typically two flagella inserting subapically, one projecting forwards in swimming cells, the other trailing. With many discoidal plastids, with chlorophylls a and c, but in this genus the plastids look as green as those of chlorophytes and euglenids. Common in acidic freshwater habitats such as bogs. Squashed specimen of Gonyostomum latum
. Wedge-shaped trichocysts are arranged around the nucleus and under the cell surface. 50 microns. Differential interference contrast.