water. In the Cystonectae subgroup, the pneumatophores have an additional function of assisting with flotation of the organisms. The siphonophores exhibiting the feature develop the structure in early larval development via invaginations of the flattened planula structure. Further observations of the siphonophore species Nanomia bijuga indicate that the pneumatophore feature potentially also functions to sense pressure changes and regulate chemotaxis in some species.

Distribution and habitat

Currently, the World Register of Marine Species (WoRMS)

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