The mantis shrimp, or stomatopod, is a type of marine crustacean of the order Stomatopoda. Most species can grow to around in length, though a few species reach up to . The largest ever caught has a length of in the Indian River near Fort Pierce, Florida of USA. The carapace of mantis shrimp covers only the rear part of the head and the first four segments of the thorax. There are more than 450 species of mantis shrimp. Varieties range from shades of brown to vivid colours, and are among the most important predators in many shallow, tropical and sub-tropical marine habitats. Despite being common, they are poorly understood as many species spend most of their life tucked away in burrows and holes.