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P. pacifica, commonly called the sea-money, is a blue-fringed disc about 1.5 inches in diameter. Members of Porpitidae are surface dwellers that, though they look like a surface dweller, are actually colonial animals, an orderly cooperative of polyps living under a specialized sail-structure. They principally prey on microplankton. This species reproduces by releasing tiny medusae which go on to develop new colonies.