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 Nautilus Shells with the help of a diagram. 1. The present specimen is the dry shell of Nautilus. 2. Nautilus is marine and cosmopolitan animal and is commonly called "pearly nautilus" and it is found in deep coastal waters. 3. The shell is spirally coiled and is divided into a [...]
In this article we will discuss about the structure of Opheolepis with the help of a diagram. 1. It is commonly known as "brittle star" and is found in shallow waters. It is usually of green colour. 2. Body comprises of a distinct and some what rounded disc and five narrow, flexible jointed and slender arms radiating from it. 3. [...]