extrusomes

Description:

Gonyostomum (go-knee-os-tea-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. Body plastic and with extrusible globules which are shown in this micrograph. Differential interference contrast.