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(ECHINODERMATA)In Holothuroidea and Asteroidea, elongated sacs in the coelom that open into the ring canal and function as expansion chambers.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
polian vesicles
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echinoderm — /i kuy neuh derrm , ek euh neuh /, n. any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea … Universalium
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