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Iconaster longimanus, the icon star or double star, is a species of starfish in the family Goniasteridae. It is found in the west and central Indo-Pacific Ocean. The genus name comes from the Greek eikon, meaning portrait or image and possibly referring to the way the marginal plates frame the disc, and aster, meaning star. The specific name comes from the Latin longus manus and refers to the long, slender arms.
Iconaster longimanus has five thin, tapering, flattened arms. It grows to a diameter of about 30 centimetres (12 in) with a central disc about 10 cm (4 in) across. It has a marginal row of large plates that resemble mosaic tiles and contrast in colour with the disc. The margin is usually tan with symmetrically arranged dark brown bands and the disc is orange-brown.
Iconaster longimanus is native to the tropical west and central Indo-Pacific Ocean. Its range includes south eastern Arabia, the Philippines, Singapore, Malaysia, the South China Sea, Indonesia and northern and western Australia. It is found at depths of between 6 to 85 metres (20 to 279 ft) in deep reef areas. It is common in Singapore where its typical habitat is lower reef slopes and adjoining areas of rubble where it feeds on lithophytes growing on rocks and coral fragments.
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