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CRUSTACEA - Online Information article about CRUSTACEA |
 | | complete degeneration is found in the Rhizocephala, which are parasitic on other Crustacea. |
| | The hind-gut is also provided with sphincter and dilator muscles, and these may produce rhythmic expansion and contraction, causing an inflow and outflow of water through the anus, which has been supposed to aid in respiration. |
| | In the parasitic Rhizocephala and in a few Copepoda (Monstrillidae) the alimentary canal is absent or vestigial throughout life. |
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