Siphonophores - The longest animals on the planet Cousins of corals, siphonophores are colonies of specialized individuals called zoids. Some catch and digest their prey, others swim, or lay eggs or sperm.
Dinoflagellate Ceratium gravidum (Photo : Sophie Marro)
Diatom genus Hemiaulus (Photo : Sophie Marro)
Deployment of a profiling float (Photo : Jean-JacquesPangrazi)