Heterozius rotundifrons, or big hand crab, is a speciesofcrab of the family Belliidae, endemictoNew Zealand. The carapace width is up to 25 millimetres (1 in).
| Heterozius | |
|---|---|
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| Preserved specimen of Heterozius rotundifrons | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Infraorder: | Brachyura |
| Family: | Belliidae |
| Subfamily: | Heteroziinae Števčić, 2005 |
| Genus: | Heterozius A. Milne-Edwards, 1867 |
| Species: |
H. rotundifrons
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| Binomial name | |
| Heterozius rotundifrons A. Milne-Edwards, 1867 | |
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.
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