Some, such as Protoperidinium conicum, can extend and withdraw a veil-like pseudopodium
(pallium) that envelops other cells, usually diatoms, which then undergo extracellular digestion.
As we document here, coronin, presumably bound to actin, appears in exceptionally high concentration each time a eupodium is transiently formed at the base of an extending pseudopodium
. Because eupodia are small ([approximately]1 [[micro]meter] in diameter), dynamic (average life is less than 3 min), and are located at the amoeba-agarose interface, we observed the agar-overlaid amoebae with a real-time confocal system (7) to achieve high temporal and spatial resolution.