In this article we will discuss about the structure of Heart Urchin (Echinocardium) with the help of a diagram. 1. It is commonly known as "heart urchin" and is a marine echinoderm found in shallow waters around coral reefs. 2. Body heart-shaped, some-what ovoid and is having a distinct oral and aboral surfaces. 3. There is neither a central disc [...]
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. [...]