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noun-plural. Invertebrate animals covered with shells, especially mollusks; shellfish.

A group of testaceous animals: variously used.

n. testacean rhizopods

"In the present state of science, it is chiefly by the aid of shells that we are enabled to arrive at these results, for of all classes the testacea are the most generally diffused in a fossil state, and may be called the medals principally employed by nature in recording the chronology of past events."

animal order   

shellfish   

tiepin    birthstone    vertebrata    ichthyology    mollusks