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Polychaetes
Polychaetes are largely marine annelid worms that are a major component of reef ecosystems. Most can be readily distinguished from opisthobranchs by their segmented bodies, leg-like parapodia and bristle-like setae. A few, however, have retractile tentacles lining the body that superficially resemble cerata or are broad and flattened resembling dorids. A close look at the undersides of these will reveal the segmentation and setae. They may be predators, scavengers or detritus feeders. Other, sedentary, tube-dwelling species have plume-like gills used in respiration and filter feeding.

A few of the species most frequently mistaken for sea slugs:
Amblyosyllis sp.
Amblyosyllis sp.
CP: Maui; April, 2007
Myrianida sp.
Myrianida sp.
CP: Maalaea Bay, Maui, Dec. 3. 2011
Iphione muricata
Iphione muricata
CP: Maui; April, 2005
For more information see:
 
Polychaetes on the Sea Slug Forum
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