pneumatophore

/noo-mat-uh-fawr, -fohr, nyoo-, noo-muh-tuh-, nyoo-/US // nʊˈmæt əˌfɔr, -ˌfoʊr, nyʊ-, ˈnu mə tə-, ˈnyu- //UK // (njuːˈmætəʊˌfɔː) //

气囊,气囊团,气囊座,气囊体

Definitions

n.名词 noun

1
- : Botany. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
- : Zoology. the air sac of a siphonophore, serving as a float.

The one end forms the pneumatophore, and the other, the oral part, the polypite.
In cases where the cormus has no pneumatophore the topmost swimming bell may contain an oil-reservoir or oleocyst.
Divergent views have been held as to the morphological significance of the pneumatophore.
Next the pit closes up to form a vesicle with a pore, and so gives rise to the pneumatophore.
Without pneumatophore, with one, two, rarely more nectocalyces.