Heterobranchia
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Heterobranchia, the heterobranchs, is a taxonomic clade of snails and slugs, which includes marine, aquatic, and terrestrial gastropod molluscs.
A shell of the marine species Bulla quoyii, which is an opisthobranch.
Caucasotachea atrolabiata
Architectonica perspectiva
Opisthobranchia
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Opisthobranchs is a now informal name for a large and diverse group of specialized complex gastropods which used to be united in the subclass Opisthobranchia. That taxon is no longer considered to rep
Bullina lineata
Aplysia californica, a sea hare.
Oxynoe olivacea