Phylum Sipuncula
Excretion
Excretory cells are found floating free in the coelomic fluid. Also, a pair of annelid-like nephridia open ventrally. The regulate volume and serve as an outlet for gametes.
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What are Sipunculans?
Feeding and Digestion
Respiration and circulation
Excretion
Reproduction
Movement
Response
Comparison to other phyla
References
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