Heterobranchia is a Subclass under Class Gastropoda.
294 species are featured, under 8 Orders: Nudibranchia (137), Aplysiida (22), Cephalaspidea (22), Systellommatophora (22), Stylommatophora (16), Ellobiida (7), Pleurobranchida (3) and Siphonariida (2).
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