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Any of various amoeboid protozoans having a hard external covering, found in soil and freshwater habitats.

[From New Latin Testācea, former order name, from Latin, neuter pl. of testāceus, covered with a shell, from testa, shell.]

tes·ta′cean adj.


(Animals) any of various invertebrate animals with a hard shell
(Zoology) (of an invertebrate) having a hard shell
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.testacean - any of various rhizopods of the order Testacea characterized by having a shell
rhizopod, rhizopodan - protozoa characterized by a pseudopod
order Testacea, Testacea - testacean rhizopods
References in periodicals archive ?
The data reported here therefore offer a unique contribution to the body of knowledge on the composition and richness of Testacean amoebae in rivers with waterfalls.
Aristotle is talking here about physis, the vital principle of plants or testaceans. A plant may need more water to stay alive than a testacean.
However, microfauna, for the most part, consist of the ciliated, flagellated, naked, and testacean protozoa.
The shell has three layers: cuticle or external, calcareous of intermediate and testacean of internal.