Incredibly, 2007âs staggering volume is almost 38 percent higher than 2006 and almost double the 2005 figure. The value of the blade market is often estimated simply as a percentage of the turbine market. It is generally assumed that blades account for 15 to 20 percent of the total purchase price of wind turbines.
The two most common species of earthworms in Northern Virginia are the Common Earthworm, or nightcrawler (Lumbricus terrestris) and the Red Earthworm (Lumbricus rubellus). These earthworms were introduced from Europe many years ago.
List of Types of Segmented Worms. Environmentally beneficial, earthworms help fertilize and aerate soil. Ryan McVay/Photodisc/Getty Images. Worms are invertebrates with long, soft bodies and no hard skeleton. Their shapes are varied, and they range in size from microscopic to 75 feet in length. Scientists have classified worms into more than 15 phyla. The phylum Annelida contains the segmented worms. Annelida is further divided into three subclasses: Oligochaeta, Hirudinea and Polychaeta. Thousands of species of segmented worms comprise these three subclasses.