A subclass of the subphylum Sarcodina (amebae), in which the cells are provided with a firm chitinous envelope, often containing earthy material, with an opening through which the pseudopodia are protruded.
[L. testa, shell]
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Thus, our species were grouped into two taxonomic categories: Arcellinida Kent, 1880 (Amoebozoa, Testacealobosia) and Euglyphida Copeland, 1956 (Rhizaria, Silicofilosea).