- pneumatosaccus
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n. [Gr. pneuma, air; sakkos, sac](CNIDARIA: Hydrozoa)In Siphonophora, an air sac; an internal subumbrellan wall.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.