In this article we will discuss about the structure of Cuttle-Fish (Sepia) with the help of a diagram. 1. It is a marine mollusc commonly called cuttle-fish and is commonly used as food. 2. Body bilaterally symmetrical, somewhat ovoid and dorsoventrally flattened. 3. Body is distinguished into head, neck (collar) and trunk (body). 4. Head is round and bears two [...]
In this article we will discuss about the structure of Pearl Oyster (Ostrea) with the help of a diagram. 1. Commonly known as "pearl-oysters", and are marine, sedentary and found attached to rocks and stones. 2. The shell is external and comprised of two unequal beautifully coloured valves. 3. Of the two valves the left is large and right is [...]
In this article we will discuss about the structure of Squid (Loligo) with the help of a diagram. 1. It is a marine mollusc commonly called squid. 2. Body is long, slender, pigmented and tapering behind. 3. A fin is present along its postero-lateral edges. 4. The shell is internal, feather-like and membranous. 5. The body is divisible into head, [...]