Describe the adaptive radiation in Polychaeta by citing examples.
Polychaetes form the largest class of annelids with more than 10,000 species, most of them marine. Although most are 5 to 10 cm long, some are less than 1 mm, and others may be as long as 3 m. Some are brightly colored in reds and greens; others are dull or iridescent. Some are picturesque, such as the “featherduster” worms.
Polychaetes differ from other annelids in having a well-differentiated head with specialized sense organs; paired appendages, called parapodia, on most segments; and no clitellum As their name implies, they have many setae, usually arranged in bundles on the parapodia. They show a pronounced differentiation of some body somites and a specialization of sensory organs practically unknown
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