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A perforated platelike structure in most echinoderms that forms the intake for their water-vascular systems.

[So called because the perforations resemble those of a madrepore.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) the opening which allows water to filter into the water vascular system of echinoderms
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmæd rəˌpɔr aɪt, -ˌpoʊr-, məˈdrɛp əˌraɪt)

a sievelike plate in certain echinoderms through which water passes into the vascular system.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Characters examined include general body appearance, encrusting ossicles, pedicellariae, madreporite, abactinals, terminals, marginals, intermarginals, actinals, oral frame, ambulacral grooves and interambulacrals, papulae, tube feet, digestive tract, and its development.
The water vascular system of this species is comprised of a circular canal as well as 5 radial canals, canals to the ambulacra, oral tentacles with their ampullae, a stone canal, and a madreporite (Fig.
Its principal goal is to constitute the applied catalogue of GFP-like proteins obtained from various non-bio-luminescent species--soft and madreporite corals, comb-jellies, actiniae etc.
One of the apical system plates, the madreporite, is unique in
For all sizes of sea stars, a flexible tape was used to measure arm length to the nearest millimeter, from the mouth to the tip of the ray nearest to the madreporite. The relationship between mussel size and tissue mass was quantified to allow calculations of Pisaster ochraceus' intake of prey tissue.
The tag was injected through the aboral surface of the body wall of the first arm counterclockwise from the madreporite, halfway down the arm.
Specimens were oriented randomly into four starting quadrants (defined by a standard x-y grid) relative to the madreporite. In each trial, 10 ml of S.
Located at interambulacrum 2 (IA2), the madreporite is also a genital plate (G2).
The organs and body fluids that were investigated were body wall with tube feet attached, perivisceral coelomic fluid, fluid from the water vascular system, circular body-wall muscle, longitudinal body-wall muscle, ampullae of tentacles, tentacles, ampullae of tube feet, calcareous ring, stone canal with madreporite attached, Polian vesicles, gut, cloaca, respiratory trees, Cuvierian tubules, hemal system, and gonad (Fig.
For every trial, the animal was placed at the origin, with its madreporite as a fixed point of reference.