What is another word for Subclass Opisthobranchia?
Pronunciation: [sˈʌbklas ˌɒpɪsθəbɹˈanki͡ə] (IPA) 
Subclass Opisthobranchia is a group of marine gastropod mollusks that includes nudibranchs, sea hares, and bubble snails. This subclass has many synonyms depending on the classification system used. Some of the most commonly used synonyms include Opisthobranchia incertae sedis, Anthobranchia, and Euthyneura. Other synonyms include Pulmonata, Notaspidea, and Pleurobranchomorpha. These synonyms reflect the ongoing debate among taxonomists about the classification of Opisthobranchia and its relationship to other mollusk groups. Despite the use of different names, the species within this subclass share important features such as a reduced or absent shell, a ventral foot for locomotion, and often spectacular and diverse coloring.
