contractile vessel(s)

contractile vessel(s)
A single or pair of tubes attached to the surface of the esophagus, anteriorly communicating with the fine vessels in the tentacles and ending blindly posteriorly; compensatory sac.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • polian vessel — see contractile vessel …   Dictionary of invertebrate zoology

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  • compensatory sac — see contractile vessel …   Dictionary of invertebrate zoology

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