coelomic sac
anatomy
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invertebrate excretory system
- In excretion: The coxal glands of aquatic arthropods
…as a small sac, the coelomic sac, which opens into a wider region, the labyrinth, having complex infoldings of its walls. The labyrinth opens either directly into the bladder, as in marine lobsters and crabs, or into a narrow part of the tubule, the canal, which in turn opens into…
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