Zooid
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A zooid or zoöid is an animal that is part of a colonial animal. This lifestyle has been adopted by animals from separate unrelated taxa. Zooids are multicellular; their structure is similar to that o
Pyrosoma atlanticum, a tunicate, is a colony of zooids
Siphonophore
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Siphonophores are cnidarian animals of the hydrozoan order Siphonophorae. According to the World Register of Marine Species, the order contains 194 species described thus far.
Zooid
…multicellular; their structure is similar to that of other solitary animals. The zooids can either be directly connected by tissue (e.g. corals, Catenulida, Siphonophorae, Pyrosome or Ectoprocta) or share a common exoskeleton (e.g. Bryozoa or Pterobranchia). The colonial organism as a whole is alternatively called a zoon…
Photographs of living siphonophores
Portuguese Man o' War (Physalia physalis)