口足目（学名： Stomatopoda）是节肢动物门甲壳亚门软甲纲掠虾亚纲之下的一个目，其物种俗称作虾蛄。其大小可达30厘米（12英寸），亦有长达38 cm（15寸）的。现时纪录有最大的虾蛄由美国佛罗里达州几位渔民于匹尔斯堡附近海域钓得，长达46 cm（18寸）。

虾蛄的头胸甲不太大，仅足以包裹至头的后部及胸的头四节。 本目在全世界有超过400个物种，颜色从褐色到浅红色不等，是热带和亚热带的底栖海床的重要掠食者。尽管很常见，我们对这些物种的认识还很少，因为牠们经常躲在浅坑和洞穴内。

The mantis shrimp, or stomatopod, is a type of marine crustacean of the order Stomatopoda. Most species can grow to around 10 centimetres (3.9 in) in length, though a few species reach up to 38 cm (15 in). The largest ever caught has a length of 46 cm (18 in) 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.