Heterocarpus
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Heterocarpus is a genus of deep-sea shrimp, mainly of tropical areas all over the world.
Heterocarpus ensifer close-up and after "vomiting" or "spitting" bioluminescent fluid.
Caridea
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The Caridea, commonly known as caridean shrimp or true shrimp
Carideans, such as Pandalus borealis, typically have two pairs of claws, and the second segment of the abdomen overlaps the segments on either side. The abdomen shows a pronounced caridean bend.
Dendrobranchiata, such as Penaeus monodon, typically have three pairs of claws, and even-sized segments on the abdomen. There is no pronounced bend in the abdomen.
Lysmata amboinensis in Tropicarium Oceanarium Budapest