Somatocyst

So´ma`to`cyst

n.	1.(Zool.) A cavity in the primary nectocalyx of certain Siphonophora. See Illust. under Nectocalyx.

[′sō·məd·ə‚sist] (invertebrate zoology) A cavity filled with air in the float of certain Siphonophora.

the air-containing cavity within the pneumatophore of a SIPHONOPHORE.

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