polian vessel

polian vessel
see contractile vessel.

Online Dictionary of Invertebrate Zoology. . 2005.

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Look at other dictionaries:

  • 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

  • contractile tubules — (SIPUNCULA) Numerous, short and simple, or longer and branching tubules originating from the contractile vessel and extending into the body cavity; polian tubules …   Dictionary of invertebrate zoology

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