The scaleless dragonfish is also the first discovered lifeform to emit a red light, with the only other being the Siphonophorae.
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).