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cnidosac
A cnidosac is an anatomical feature that is found in the group of sea slugs known as aeolid nudibranchs, a clade of marine opisthobranch gastropod molluscs.〔Nudibranch.com.au website, Nudibranch Glossary, Definitions of terms relating to Opisthobranchs, () Accessed 2014-9-6〕 A cnidosac contains cnidocytes, stinging cells that are also known as cnidoblasts or nematocysts. These stinging cells are not made by the nudibranch, but by the species that it feeds upon. However, once the nudibranch is armed with these stinging cells, they are used in its own defense.
==Description and functions==
The sea slugs within the nudibranch clade Aeolidida have protruding cerata (singular "ceras") on their dorsal surface. At the tip of each ceras is a small sac in which nematocysts (stinging cells) are stored. These nematocysts originate in the cnidarians (such as sea anemones, hydroids, jellyfish, corals, siphonophores, etc.) that are the food source for aeolid nudibranchs.〔Seaslugforum.net, Aeolid cnidosac, () Accessed 2014-10-30〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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