Naucoridae is a small family of insects commonly known as the creeping water bugs and Saucer bugs. They are very similar in appearance and behavior to the giant water bugs (Belostomatidae), and also occur in ponds and other still waters. However, most species are lotic, occurring in streams, rivers, and even a few on waterfalls. There are approximately 395 species in 40 genera in 5 subfamilies. Their distribution is primarily tropical, although a few taxa occur in northern and southern temperate regions.