A madreporite is a porous, sieve-like structure on the surface of echinoderms, such as starfish and sea urchins, which is part of their water vascular system. It acts as a water filter and regulates the flow of water into the system, which is crucial for their locomotion and feeding.

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A Madreporite Is

Question 33

Multiple Choice

A madreporite is

A) the swim bladder of ray-finned fishes.
B) the pectoral appendages of lungfish.
C) a sac at the base of the tube foot of echinoderms which regulate water flow.
D) a porous, sieve-like plate on the body surface of an echinoderm.
E) blocks of muscle on each side of the tunicate body.

Correct Answer: