Patterson, David J. Department of Zoology, University of Bristol, Bristol, United Kingdom.
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An order of Heliozoia. These ameboid organisms live in a stalked perforated organic or inorganic lorica. Stiffened pseudopodia extend from the perforations to capture food which collides with them. The best-known species is Clathrulina elegans, found in freshwater environments (see illustration). This species has a spherical organic test. Unlike most Heliozoia, it has a life cycle which involves motile flagellated cells which arise from the sessile form and then may settle, transforming into amebas with thin pseudopodia. These ameboid forms secrete the stalk and lorica to give rise to the typical sessile (trophic) organism. Under unfavorable conditions, the organism encysts within the lorica. See also: Heliozoia; Protozoa; Sarcodina
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