Protobranchia

plural noun
Pro·to·branchia

Definition of Protobranchia 

: an order of Lamellibranchia comprising primitive bivalve mollusks in which the gills consist of a double row of simple lamellae not reflected or united

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Other Words from Protobranchia

protobranchiate \¦⸗(ˌ)⸗+ \ adjective

History and Etymology for Protobranchia

New Latin, from prot- + -branchia

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