SINCE 1828
Pectinacea
plural noun
Pec·ti·na·cea
| \ ˌpektəˈnāshēə\
Definition of Pectinacea
: a suborder of Filibranchia comprising active bivalve mollusks that have a fan-shaped shell and no siphons including the typical pectens and related forms
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Merriam-Webster unabridged
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