protobranch
/ˈprəʊtə(ʊ)braŋk/Zoology and Palaeontology
noun
A bivalve mollusc of the relatively primitive subclass Protobranchia, whose members are characterized by gills having a simple leaflike structure.
adjective
Designating, relating to, or characterized by a type of molluscan gill having a simple, leaflike structure, as in bivalve molluscs of the subclass Protobranchia.
Origin
Late 19th century; earliest use found in American Naturalist. From proto- + -branch, after scientific Latin Protobranchia, subclass name.
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