The Collaborative International Dictionary of English v.0.48:
Testacea \Tes*ta"ce*a\, n. pl. [NL., fr. L. testaceum a shelled anumal. See Testaceous.] (Zool.) Invertebrate animals covered with shells, especially mollusks; shellfish. [1913 Webster]WordNet (r) 3.0 (2006):
Testacea n 1: testacean rhizopods [syn: Testacea, order Testacea]