Notaspidea
Quick Summary
The order Notaspidea is a group of marine gastropods, commonly known as sea slugs. These mollusks are characterized by the presence of a shell and a gill, though these can be reduced or hidden by the mantle. Unlike some other sea slugs, they lack parapodia, which are extensions of the foot.1
The classification of gastropods has undergone significant revisions, with ongoing debates between traditional anatomical studies and cladistic approaches informed by molecular data. The Notaspidea order is part of the subclass Opisthobranchia, which includes a diverse range of gastropods, many of which have reduced or absent shells.21
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