Group of Gastropods also known under the name Prosobranchia. It are usually shelled species with a visceral torsion of 180 degrees and separate sexes. It is composed of the Superorders Archaeogastropoda, Mesogastropoda (to which the Heteropoda and Janthinidae belongs) and Neogastropoda.
Kingdom Animalia Phylum Mollusca Class Gastropoda Subclass Streptoneura
Scientific synonyms and common names
Subclass Streptoneura Spengel, 1881
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