Hall, Richard P. University of California, Los Angeles, California.
An order of the subclass Filosia comprising a small group of naked amebas which form filamentous pseudopodia (filopodia). The genus Penardia, possibly the only valid one in the order, includes filopodia-forming amebas with variable shape, an outer zone of clear ectoplasm, and inner cytoplasm often containing many vacuoles and sometimes zoochlorellae (see illustration). Pseudopodia are sometimes extended primarily at the poles of the organism, but also may fuse laterally to form small sheets of clear cytoplasm. A single nucleus and one water-elimination vesicle are characteristic of these amebas. Size of described species ranges from less than 10 to about 400 micrometers. See also: Protozoa; Rhizopodea; Sarcodina; Sarcomastigophora
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