Rhizaria: Forams and Radiolarians
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State
Rhizaria is defined by thin, thread-like or needle-like pseudopodia, distinct from Amoebozoa's broader lobes; forams and radiolarians are its shelled representative subgroups.
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A foraminiferan builds a porous, calcium-carbonate test; a radiolarian builds an intricate, glassy silica shell with radial symmetry.
Watch for
Confusing Rhizaria's thin, thread-like pseudopodia with Amoebozoa's broader lobes can mis-sort a shelled amoeba into the wrong supergroup.
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