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Haplosyllis spongicola : ウィキペディア英語版 | Haplosyllis spongicola
''Haplosyllis spongicola'', the sponge worm, is a species of polychaete worm in the family Syllidae. It was previously classified as ''Syllis spongicola'' and is part of a species complex of closely related species that are difficult to distinguish morphologically and where the demarcation between them is unclear. It is found in shallow temperate, subtropical and tropical seas worldwide, wherever its host sponges are found. ==Description== ''Haplosyllis spongicola'' is a small white segmented worm which lives parasitically on about forty known species of sponge around the world. It grows to a length of several centimetres. The body is cylindrical and the prostomium bears three antennae and four eyes. The pharynx has a single tooth surrounded by conical fleshy protuberances. Each segment bears paired appendages known as parapodia with tufts of cilia known as cirri on the dorsal and ventral sides. There are also a small number of simple chaetae or bristles on each segment.
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