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The large spore of Arthrobotrys anchonia contains sufficient reserve nutrients to produce a hypha with three to five traps (three-celled constricting rings) at intervals along its length.  In this photomicrograph one of the traps has been triggered and the three cells have expanded inwards to close the aperture.  See what happens when a nematode sticks its head or tail ( or both ) in a ring (click here).