How big do polychaetes get?
The size range of adult polychaetes is immense. There are some species with adults that are so small that they live between sand grains. The longest polychaetes have been known to be up to 200 feet long, although these are very threadlike. The vast majority of polychaetes, however, range from less than one third of an inch to only several inches in length. This is why they are so easily overlooked when one is casually exploring the sea shore.
