The Bowed Fiddler Crab, Uca arcuata, is one of the more widespread and better known species from eastern Asia, found along the coasts of China, South Korea, Taiwan, and Japan. It is a large species, with a dark brown or maroon carapace (often with cream edges and highlights), cream eyestalks, black-to-red legs, and a robust major claw with a red hand and cream fingers.
In parts of its range, both males and females of this species build chimneys around the mouths of their burrows, extending the entrance upward from the muddy surface. They are often found on open mud flats and banks near the mouths of rivers. This species has been the focus of many studies by marine ecologists in both China and Japan.
Jocelyn Crane reported that this species could sometimes be found canned in local seafood markets in Japan, making it one of only two species eaten by humans.