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Polycarpa fibrosa
''Polycarpa fibrosa'' is a species of tunicate in the family Styelidae. It is brown and globular and its outer surface is covered with a mat of fibrils. It normally lies buried in soft sediment on the seabed with only its two siphons protruding. It occurs in the Arctic Ocean and northern Atlantic Ocean. ''P. fibrosa'' was first identified and described by the American malacologist William Stimpson in 1852.
==Description==
''Polycarpa fibrosa'' is globular or ovoid in shape and is about in diameter. It has a sac-like body with a tough covering known as a tunic, and is densely clad in short fibrils. There are two long, tapering, four-lobed siphons on the upper surface. Water is drawn into the body cavity through one of these, the buccal siphon, and expelled through the atrial siphon. The buccal siphon has a ring of up to 60 tentacles round the rim. These function to prevent particles that are too large from being drawn into the body cavity. This tunicate is a brownish colour and is well camouflaged, as particles of sand, shell fragments and mud adhere to the fibrils. It is usually partially buried in the sediment on the seabed with the two siphons projecting.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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