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
Notodoris minor
Bullina lineata
Aplysia californica, a sea hare.
Oxynoe olivacea
Heterobranchia
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Heterobranchia, the heterobranchs, is a taxonomic clade of snails and slugs, which includes marine, aquatic, and terrestrial gastropod molluscs.
Opisthobranchia
…considered monophyletic. Euopisthobranchia does not include some "traditional" opisthobranchs such as the Sacoglossa and the Acochlidiacea. The subclass Heterobranchia now contains all the species which used to be assigned to Opisthobranchia, plus all the species in the Pulmonata. The subclass Opisthobranchia included…
Heterobranchia composite 03
A shell of the marine species Bulla quoyii, which is an opisthobranch.
Caucasotachea atrolabiata
Architectonica perspectiva