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 Sea Urchin (Echinus) with the help of a diagram. 1. It is commonly known as “sea urchin” and is formed in shallow water in both rocky and sandy place in sea. 2. Body is Sub-globular and convex or dome-shaped above and flattened below. The aboral and oral surfaces are distinct. [...]
In this article we will discuss about the structure of Cucumaria with the help of a diagram. 1. It is commonly known as "sea cucumber", is marine and is found in shallow waters. 2. Body elongated, cylindrical, five sided, swollen in the middle and narrow at two ends. 3. The mouth and anus (cloaca) are situated at opposite ends. 4. [...]