Florent's Guide To The

Tropical Reefs

Orangutan Crab
Oncinopus sp. 1
Orangutan Crab
Category: Decorator Crabs
Scientific Name: Oncinopus sp. 1
Synonyms: Achaeus japonicus
Size: Up to 1 in. (2.5 cm)  
Depth: 10-75 ft. (3-23 m)
Distribution: West Pacific, Indonesia
Note: Formerly classified as Achaeus japonicus, genus identification tentative
Arthropoda (Phylum)
└Crustacea (Subphylum)
 └Malacostraca (Class)
  └Eumalacostraca (Subclass)
   └Decapoda (Order)
    └Pleocyemata (Suborder)
     └Brachyura (Infraorder)
      └Inachidae (Family)
       └Oncinopus (Genus)

Crustaceans
Decorator Crabs

Orangutan Crab

Sponge Spider Crab



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© 2025 Florent Charpin