madreporite
porous plate leading to the watervascular system of certain echinoderms, such as starfish
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
madreporite Sievelike structure that is the intake for the water-vascular system of echinoderms.
magma Molten rock from deep in the earth's interior; called lava when it spews from volcanic vents.
Water enters on the aboral side through the sieve plate, which is also known as the madreporite. Water passes through a stone canal to a ring canal and into the radial canals in each arm.
 See also: Vascular system, Organ, Membrane, Vision, Skin
  
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