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Calliactis parasitica
''Calliactis parasitica'' is a species of sea anemone associated with hermit crabs. It lives in the eastern Atlantic Ocean and Mediterranean Sea at depths between the intertidal zone and . It is up to in size, with up to 700 tentacles, and is very variable in colour. The relationship between ''C. parasitica'' and the hermit crab is mutualistic: the sea anemone protects the hermit crab with its stings, and benefits from the food thrown up by the hermit crab's movements.
==Description==
''Calliactis parasitica'' is up to tall, and wide, with the base of the column being slightly wider. The surface of the column is rough and leathery with a grainy appearance, but has no tubercles and is not divided into sections.〔 It is variable in colouring,〔 but is usually cream or buff in colour, with blotches and streaks of reddish or greyish brown, which tend to form vertical stripes.〔
The basal disc is concave, and able to stick firmly to the substrate.〔 Above this lies the limbus (the junction between the basal disc and the column), and just above that are the relatively prominent cinclides (specialised pores), each on a small mound.〔 These readily emit threadlike acontia (stings) when the animal is disturbed.〔 At the top of the column are up to 700 slender tentacles of moderate length.〔 They are translucent, and yellowish to orange in colour, with longitudinal lines of reddish brown.〔
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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