Watasenia scintillans, known commonly as the Sparkling Enope squid, or Firefly squid. Each tentacle has a photophore (a light-emitting organ) which flashes to attract prey. They light up their whole bodies to attract mates.
the blue button jelly - is a species mostly found in the tropics; it floats near the surface of the water. The circular disc is made of chitin and filled with gas, allowing these jellies to float. The tentacles radiating from the disc do all the feeding.
The firefly squid (Watasenia scintillans) (also known as sparkling enope squid) is a small member of the squid family, growing to a length of only It is found at depths of in the Western Pacific ocean.