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'Tryblidioidea' can also refer to...


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(phylum Mollusca, class Monoplacophora)

An order of mainly oval monoplacophorans, fossil forms of which have several symmetrically paired muscle scars. Shells are often thick, and sometimes ornamented with concentric growth lines. Tryblidioidea first appeared in the Early Cambrian.

Subjects: Zoology and Animal Sciences.

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