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 [...]
In this article we will discuss about the structure of Cowries (Cyprea) with the help of a diagram. 1. Commonly known as "cowries" and are found among coral reefs in Indian and pacific oceans. 2. Shell external, shiny, convoluted brightly polished and remains lined internally by mantle so long the animal is alive. 3. Mantle bears numerous sensory papillae or [...]
In this article we will discuss about the structure of Terebra & Terebellum (Shankh) with the help of a diagram. 1. They are called "turret shells" and are marine molluscs. 2. They exhibit torsion and the nervous system is twisted in a figure of 8. 3. In these molluscs the left side has completely atrophied. 4. They have single [...]