Euthyneura is a taxonomic infraclass of snails and slugs, which includes species exclusively from marine, aquatic and terrestrial gastropod mollusks in the clade Heterobranchia.
Euthyneura
Berthella martensi, a pleurobranch with the gill on the right side.
Heterobranchia, the heterobranchs, is a taxonomic clade of snails and slugs, which includes marine, aquatic and terrestrial gastropod mollusks.
Heterobranchia
A shell of the marine species Bulla quoyii, which is an opisthobranch.
Berthella martensi, a pleurobranch.