DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF THE ECHINODERMS
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| Filter feeder |
The animals ‘‘ Inch filter food particles form the \\ ater current are called filter feeders. |
| Ossieles |
Ossicle are endodcrmal skeleton of echinoderms. |
| Water vascular system |
Water vascular system composed of water-tilled canals. These canals arc used in locomotion. attachment and feeding. |
| Enterocuelous |
This coelomis formed by the out pocketing of the embroynic gut. |
| Tube feet |
Tube feet arc extensions of the canal system. |
| Coelomocytcs |
Coelomocyctes are cells that engulf and transport waste particles within the body. |
| Dermal branchiae |
Thin folds of body wall extend between ossicles. It is called dermal branehiae. It is involved in gas exchange. |
| Pedieellarieae |
The aboral surface of sonic sea stars has numerous pincher like structures called pedicellarieae. |
| Spanning pheromones. |
This pheromone induced the other sea stars to spawn |
| .Autotomy |
If a brittle star is grasped by an arm, the contraction of certain muscles separate the arm form the body. This process is called autotomy. |
| Aristotle’s lantern |
.This apparatus can be projected from the mouth. Aristotle’s lantern consists of 35 ossicles and attached muscles. It cuts food into small pieces for ingestion. |
| Evisceration |
Sometimes. contraction of the body expels the one or both respirators tree, the digestive tract, and the gonads through the anus. This process is called evisceration. |
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