Noctiluca scintillans (photo: Maria Antónia Sampayo)
Noctiluca scintillans (above) is a bioluminescent marine dinoflagellate.
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Noctiluca scintillans bioluminescence (photo: Sander van der Wel)
Noctiluca scintillans produces beautiful displays of bioluminescence round the world. Above and below, two examples of these “sea sparkles”. Lovely!
Noctiluca scintillans again (photo: Adrian Kingsley-Hughes)
Scientific Gems 
This is amazing
Yes, they are pretty cool! There are some even better pictures (and some photography tips) here.