In this article we will discuss about the structure of Ophiothrix with the help of a diagram. 1. They are commonly known as brittle stars, are found in shallow waters and are usually of a 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. [...]
In this article we will discuss about the structure of Ophiocoma with the help of a diagram. 1. Commonly called brittle stars and are found in north Atlantic Mediterranean and tropical west-Indian coasts. 2. The body comprises of a round central disc having leathery (smooth) oral side and granularaboral surface. 3. From the disc radiate five cylindrical arms having four [...]
In this article we will discuss about the structure of Sand Dollar (Echinarachinus) with the help of a diagram. 1. It is commonly known as "sand dollar" and is a marine echinoderm found buried in sand at the bottom of sea. 2. Body flattened and somewhat round but without any central disc or arms. 3. Whole body surface is covered [...]