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Noun: subclass Opisthobranchia
  1. Gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
    - Opisthobranchia

Type of: class

Part of: class Gasteropoda, class Gastropoda, Gasteropoda, Gastropoda

Nearest

subclass Heterobasidiomycetes
subclass Holocephali
subclass Homobasidiomycetes
subclass Infusoria
subclass Lepidosauria
subclass Liliidae
subclass Magnoliidae
subclass Malacostraca
subclass Metatheria
subclass Ophiurida
subclass Opisthobranchia
subclass Ostracoda
subclass Pantotheria
subclass Phytomastigina
subclass Prototheria
subclass Rhizopoda
subclass Rosidae
subclass Selachii
subclass Synapsida
subclass Teleostei
subclass Telosporidia