Amphithrax

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Amphithrax
Amphithrax aculeatus
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
Infraorder: Brachyura
Family: Mithracidae
Genus: Amphithrax
Windsor & Felder, 2017

Amphithrax is a genus of saltwater crabs belonging to a group (superfamily Majoidea), often known as spider crabs or decorator crabs.

Description

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On the iNaturalist page comparing pictures of the various Amphithrax species it is seen that they all share these features:[1]

  • spoon-shaped claw tips
  • legs armed with tubercles and sometimes hairlike or sharp projections
  • the fronts of their carapaces bear various pointed projections, sometimes with those around the eyes particularly developed

Habitat

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Amphithrax species occur among coral rocks and rubble, beneath sea anemones and in rock crevices in intertidal zones to subtidal zones of up to 60 meters depth (~200 feet).[2]

Range

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The map registering observations of Amphithrax species at iNaturalist documents the genus's presence in tropical and subtropical waters of the Americas.[3] Amphithra armatus has been recorded in the western Pacific, in Taiwanese waters, as an invasive species.[4]

List of species

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In 2025, these are the accepted species of the genus Amphithrax:[5]

References

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