1 The population density in Parkersburg is 3367% higher than West Virginia. 2  The median age in Parkersburg is 1% higher than West Virginia. 3  In Parkersburg 95.35% of the population is Caucasian. 4  In Parkersburg 1.77% of the population is African American.  In Parkersburg 0.47% of the population is Asian.
The Polychaeta or polychaetes are a paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. Indeed, polychaetes are sometimes referred to as bristle worms.
There are marine, freshwater and terrestrial annelids, both free-living and parasitic. There are three classes of annelids: 1  Class Polychaeta: These annelids have conspicuous segments with lateral projections called parapodia, and bear prominent tentacles on the head. 2  Most are marine. 3  Class Oligocheta: These annelids have conspicuous segmentation, but lack a well-defined head.