AppearanceWith 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''.
NamingHumann 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."
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