Stomatopoda are also very dangerous marine crustaceans. About 450 million of these animals have been described so far.

An excerpt from the article 22 facts about crustacean

Like pistol shrimp, they are capable of striking their victims with a modified second pair of legs. These can be terminated with blunt hardened spears or pointed ends. The attack speed of these legs can reach 83 km/h and during the attack, as in the case of pistol shrimps, an air bubble is produced.

Stomatopoda with blunt-tipped legs choose crabs, snails, and clams for their prey, whose carapaces they split with ease. Species with pointed legs choose prey with soft uncovered flesh that they can pierce - mainly fish.