A perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled.
- One of the genital plates serves as the sieve plate, or madreporite, for the water vascular system.
- The water vascular system of the sea stars open up at the madreporite, a perforated opening in the central part of the animal.
- Virtually all extraxial body wall in asteroids is of the perforate variety, since it includes body openings such as papular pores, hydropores in the madreporite, gonopores, and the anus.
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