Belliidae is a family of crabs of the order Decapoda.
They respond to predators by hyper-extending all of their limbs and remain in this position a long time (Hazlett).
Seven species belong to the family Belliidae :[1]
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Hazlett, B. A., & Mclay, C. L. (2005). Anti-predator responses of the intertidal crab Heterozius rotundifrons (Brachyura: Belliidae) in air and water. Marine & Freshwater Behaviour & Physiology, 38(2), 95–103. doi:10.1080/10236240500078339.