Chasmagnathus
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Chasmagnathus convexus is a common mud-flat crab of the family Varunidae, which is endemic to East Asia.[1][2] In Japan, this crab is commonly called hamagani. This crab has two forms that differ in color; one is olive green and the other is purple.[1] Differences in diet are believed to be responsible for the color variation between the two forms. C. convexus is large, relative to related crabs, and can reach Script error: No such module "convert". wide across its carapace.[3] It is predominantly nocturnal.[1]
File:Mud-Flat Crab (Chasmagnathus convexus) (5780853050).jpg
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References
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