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polychaete

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polychaete

Any of about 5,400 species of marine worms of the annelid class Polychaeta, having a segmented body with many setae (bristles) on each segment. Species, often brightly coloured, range from less than 1 in. (2.5 cm) to about 10 ft (3 m) long. Most body segments bear two bristly parapodia (lobelike outgrowths). The head has short sensory projections and tentacles. Adults may be free-swimming or sedentary; larvae are free-swimming. Found worldwide, polychaetes are important for turning over sediment on the ocean bottom. One species, the bloodworm, is a popular saltwater fish bait. See also tube worm.



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Her data from two polychaete worms and a mussel indicate coastal concentrations of some common pollutants--several fuel-related hydrocarbons and the metals cadmium and copper--can slow and damage sperm.
No other polychaete with labidognath apparatus has similar transversal ridges, but some polychaeturids may have anterior denticles of the MI that are slightly transversally stretched (Hints 2000, pl.
2005) studied the polychaete associated to abalone culture in Southern Chile and do not register the presence of any member of the genus Dodecaceria.
 
 
 
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