Description of Actinommidae
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Spumellarid polycystines, solitary species with latticed or spongy spherical, subspherical, or ovoid shells (not discoidal, nor equatorially constricted ellipsoids); with or without medullary shells. Surface of shell is often covered with spines, but not tubes. All actinommids posses either single or multiple, concentric spherical or ovoid shells. When several shells are present they are connected to each other by radial beams which pierce the cell.
