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testacean

[te-stey-shuh n] /tɛˈsteɪ ʃən/
adjective, Zoology
1.
having a shell or test.
Origin
1835-1845
1835-45; < Latin testāce(us) shell-covered, testaceous + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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testacean in Science
testacean
  (tě-stā'shən)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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