DEFINITIONS AND KEY POINTS FOR OBJECTIVES

DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF THE ECHINODERMS


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TERMS DEFINITIONS
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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