Family Arcellidae

The test is simple and membranous, without foreign bodies, platelets or scales. The pseudopods are filose or simply branched and do not anastomose. There are many genera and species of free-living protozoa in this family. They are found commonly in fresh water, swamps, etc. One species is coprophilic.

Genus Chlamydophrys

The test is rigid and circular in cross section. The nucleus is vesicular, with a prominent endosome. The cytoplasm is differentiated into distinct zones, and refractile waste granules are present in it. The pseudopods are branching.

Chlamydophrys stercorea Cienkowski, 1876 has an oval, white porcelaneous, thin, smooth shell open at the pointed end. It measures about 20 by 14 u. The pseudopods are filose. Somewhat smaller naked amoebae may also be seen. The cysts are uninucleate, 12 to 15 u in diameter, with thick, irregular, brownish walls. Multiplication is by budding. C. stercorea is coprophilic and may also be found in fresh water.

Order Amoeborida

Members of this order have lobopodia and are naked, without a test. All of the parasitic and all but one of the coprophilic Sarcodasida are found in this order.