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In this article we will discuss about the structure of Sea Butterflies with the help of a diagram.
1. Commonly known as “sea butterflies”.They are pelagic and are found along Atlantic coast swimming or attached to sea weeds.
2. Foot well developed, very prominent and is modified into a pair of wing-like epipodia or fin (pteropod) for swimming and springing from one place to other.
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3. Shell hollow, conical, straight transparent and calcareous.
4. Mantle, gins, nephridia and operculum are absent.
5. Hermaphrodite and carnivorous.
