The Atlantic pygmy octopus, also known as the small-egg Caribbean pygmy octopus, is a small octopus species in the order Octopoda. Fully grown, this cephalopod reaches a mantle length of 4.5 centimetres with arms up to 9 centimetres long. They are known for being intelligent creatures with keen senses, particularly good sight. O. joubini often seeks shelter from predators in empty clamshells, cans or small openings, pulling the opening closed with its arms, combining sand and gravel to form a lid. It employs the two defensive mechanisms typical of all octopuses: ink sacs and camouflage. All Cephalopods have chromatophores, special pigmented and light reflecting cells on their skin which allows them to change colour and texture quickly. They are found in the Atlantic Ocean, particularly in the tropical waters of the Caribbean and the Gulf of Mexico. The first holotype was collected in 1929 by Guy Coburn Robson and became a key factor in distinguishing between O. joubini and the closely related Octopus mercatoris . Much of the information about O. joubini was obtained through laboratory studies of captive specimens and what little is known about their behavior in a natural environment is inferential.
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