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Serpula vermicularis
''Serpula vermicularis'', known by common names including the calcareous tubeworm, fan worm, plume worm or red tube worm, is a species of segmented marine polychaete worm in the family Serpulidae. It is the type species of the genus ''Serpula'' and was first described by Linnaeus in 1767. It lives in a tube into which it can retract.〔
==Description==
''Serpula vermicularis'' lives in a calcareous tube which is attached to a rock, boulder or other hard surface. The tube is often curved, but is not tightly coiled as in some other related species. It can grow to a length of , but is usually shorter than this. The anterior part of the worm protrudes from the tube and has a plume of about 40 feather-like radioles projecting from the second segment, or peristomium, which also houses the two eyes and the mouth. The radioles are bipinnate and covered with fine cilia. They are commonly red, orange or pink and are usually banded with white. A funnel-shaped lid or operculum covers the entrance to the tube when the animal retracts inside. This lid has up to 160 fine creases around its edge and is symmetrical and usually red. It is sometimes divided into two. The yellow-coloured body has seven thoracic segments and up to 190 abdominal segments which are protected by the tube. At least four segments with setae (bristles) are found in the thoracic region.〔(''Serpula vermicularis'' Linnaeus, 1767 ) Walla Walla University. Retrieved 2011-10-30.〕
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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