Thick-legged Fiddler Crab (Paraleptuca crassipes) ベニシオマネキ
Thick-legged Fiddler Crabs are red, black, blue or some combination of those colors. the male has one very large claw. Females have small claws. They live in intertidal Mangrove areas. Miyakojima 2017
This male Thick-legged Fiddler Crab has a black carapace with blue spots. Miyakojima 2017
The male Thick-legged Fiddler Crabs use their large claws to attract females and to fight. Some are right clawed, and some are left clawed.
They hide quickly in their burrows when they sense danger. Miyakojima 2017