Time Traveler for madreporite The first known use of madreporite was in See more words from the same year. Statistics for madreporite Look-up Popularity. Style: MLA. More from Merriam-Webster on madreporite Britannica. Get Word of the Day daily email! Test Your Vocabulary. The madreporite is located on the aboral top surface in sea stars, sand dollars, and sea urchins, but in brittle stars, the madreporite is on the oral bottom surface.
Sea cucumbers have a madreporite, but it's located inside the body. Exploring a tide pool and find an echinoderm? If you're looking to see the madreporite, it is probably most visible on sea stars. The madreporite on a sea star starfish is often visible as a small, smooth spot on the sea star's upper side, located off-center. It is often made up of a color that contrasts with the rest of the sea star e.
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Five or more radial canals extend from the ring canal, one in each arm above the ambulacral groove. From the radial canals extend many lateral canals, each of which leads to a tube foot. Each tube foot is a closed cylinder with muscular walls, having a sucker at the outer end and a bulb-like ampulla at its inner end within the body cavity. We're doing our best to make sure our content is useful, accurate and safe. If by any chance you spot an inappropriate comment while navigating through our website please use this form to let us know, and we'll take care of it shortly.
Forgot your password? Retrieve it. If by any chance you spot an inappropriate image within your search results please use this form to let us know, and we'll take care of it shortly. Term » Definition. Word in Definition. Wiktionary 0. Webster Dictionary 0. Freebase 5. How to pronounce madreporite? Compared to starfish, the rigid test of sea urchins reduces the need for an influx of seawater through the madreporite, but some small admission is still essential. Abstract An effort was made to demonstrate an influx of seawater through the madreporites of sea urchins and to evaluate how such an influx, along with osmotic differences and other factors, could contribute to fluid homeostasis.
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