Pectinibranchia

plural noun
Pec·​tini·​bran·​chia | \ˌpektənəˈbraŋkēə, pekˌtin-\

Definition of Pectinibranchia 

: a large order of Gastropoda (subclass Streptoneura) comprising univalve mollusks that have a single kidney, have typically a single ctenidium which resembles a comb and is usually attached to the mantle throughout its length, and have a heart with only one auricle

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History and Etymology for Pectinibranchia

New Latin, from pectin- + -branchia

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