Septibranchia

plural noun
Sep·​ti·​bran·​chia | \ ˌseptəˈbraŋkēə\

Definition of Septibranchia

: a small order of Lamellibranchia comprising marine bivalves with gills reduced to a horizontal symmetrically fenestrated muscular partition

History and Etymology for Septibranchia

New Latin, from sept- + -branchia

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