The Structure and Mode of Function of the Water Vascular System of a Brittlestar, Ophioderma appressum

Unlike the asteroids, which have large madreporite structures, the ophiuroid Ophioderma appressum possesses only two small hidden madreporite pores. Experiments with labeled amino acids, fluorescent microbeads, and surgical obstruction show that small amounts of seawater do routinely enter these por...

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