What's the difference between i.e. and e.g.?
Any of various protozoans of the order Arcellinida (or Testacida) that are encased in a shell. Testaceans are rhizopods and are related to amoebas. Their shell usually has one chamber and may be secreted by the organism as a chitinous or siliceous covering, or may be glued together out of sand particles.