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, [...]
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. [...]