Orang-utan crab

Achaeus japonicus

''Achaeus japonicus'', sometimes known as the orang-utan crab, is a crab of the family Majidae has been observed in tropical waters of the Western Pacific Ocean from Indonesia to Fiji, as well as in coastal waters of Japan.
Orang-utan crab - Achaeus japonicus Always a welcome sight in the coral reef :-) Achaeus japonicus,Fall,Geotagged,Indonesia,Orang-utan crab

Appearance

With a carapace of only about 2 centimetres or 0.8 inches in diameter, it has relatively long arms, which are thickly covered with fine hairs, red or reddish brown in color, and often laden with small bits of debris for further camoflage. It is frequently, but not always, found in association with the bubble coral ''Plerogyra sinuosa''.
Orang-utan crab - Achaeus japonicus A bit less fluffy and in a different environment. Achaeus japonicus,Fall,Geotagged,Indonesia,Orang-utan crab

Naming

Humann and DeLoach classify the orang-utan crab as ''"Oncinopus sp. 1"'' and assert it was "formerly classified" as ''Achaeus japonicus,'' though they describe their own genus identification as "tentative."

References:

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Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassMalacostraca
OrderDecapoda
FamilyInachidae
GenusAchaeus
SpeciesA. japonicus