Giant water bug

Lethocerus indicus (Le Peletier & Serville, 1825) is a large aquatic true bug (Belostomatidae) ranging from peninsular India, Sri Lanka and Bangladesh through Southeast Asia to southeast China, Taiwan, Sumatra, Java, the Philippines and western New Guinea. Females measure 74.0-80.0mm and males 64.0-77.6mm. It closely resembles the Japanese giant water bug Kirkaldyia deyrolli but differs in its smaller forelegs, rounder and more closely set eyes, even broader and flatter hind legs, dark streaks on the scutellum and forewings, and an inverted-V mark on the thorax. It lives in clean, still water with a steady level and plenty of aquatic plants. In Japan it was recorded only on Yonaguni, has not been seen since the late 1970s and is listed as Critically Endangered on the national Red List. Both sexes give off a distinctive scent, and in Thailand, Vietnam and elsewhere it is widely used as food and flavouring. Japanese pet shops occasionally sell it under locality names such as Burmese or Javan giant water bug. It is harder to keep than the Japanese species, but with good care long-term keeping and breeding are possible.

Source: Wikipedia (CC BY-SA 4.0)

The Giant water bug grows to Females 74.0-80.0mm, males 64.0-77.6mm.