Zosimus aeneus

Killer Crab, a reference photo
Photo: Ewout Knoester · CC BY-SA 4.0 (licence)

Zosimus aeneus, also known as the devil crab, toxic reef crab, and devil reef crab, is a species of crab that lives on coral reefs in Indo-Pacific, from East Africa to Hawaii. It grows to a size of about 60 mm × 90 mm (2.4 in × 3.5 in) and has a distinctive pattern of brownish blotches on a paler background. It is potentially lethal due to the presence of neurotoxins tetrodotoxin and saxitoxin in its flesh and shell.

From Wikipedia, under CC BY-SA 4.0.

Is it venomous or poisonous?

We have no record of Killer Crab being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Animalia
Phylum
Arthropoda
Class
Malacostraca
Order
Decapoda
Family
Xanthidae
Genus
Zosimus
Species
Zosimus aeneus

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