Flashing Comb Jelly - Ctenophores
Commonly known as Comb Jelly, Ctenophores are mostly translucent/transparent, able to retract and expand their body and emits out lights as it swim through the water column. Saw quite a lot of them during a dive, quite large in size, mostly around 15 cm when retracted and when it opens up, it looks like a space ship (Empire's Tie Fighter in Star Wars) with 'wing-span' of around 30 cm. The bioluminescence lights they emits can sometimes be captured in neon colour under flash photography as shown in this picture.
Read more about them and their interesting evolutionary history here :
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