Species of crustacean
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Heterozius rotundifrons, or big hand crab, is a species of crab of the family Belliidae, endemic to New Zealand. The carapace width is up to .
Behavior.
When threatened, Heterozius rotundifrons has a unique antipredator behavior where it fully extends all its limbs including its chelipeds and becomes immobile. The crab keeps defensive stance for up to a few minutes. 