More than 15,000 species of annelids exist, including earthworms, leeches and polychaetes, which include fireworms, clam worms, lugworms and bristleworms. Earthworms are probably the most commonly known type of annelids; there are more than 2,700 species of earthworms, with the longest species capable of growing up to 22 feet long.Know More
All species that belong to the phylum Annelida are invertebrate worms with segmented bodies, which allow them to be incredibly flexible and mobile. The majority of annelids tend to live in either soil or freshwater, although there are a few species that live on, rather than in, the ground.
The digestive system of annelids consists of a single tube that runs the length of the worm, with the mouth at one end and the anus at the other. Most annelids feed by passing soil through their bodies, absorbing nutrients from microscopic organisms in the soil. However, there are also parasitic annelids that feed off of a host organism, with blood-sucking leeches being the most common example.
Earthworms exist in huge numbers all around the world in virtually any soil that isn't frozen. It has been estimated that one acre of soil typically contains as many as 1 million of them.Learn more about Worms
Annelids live all over the world in all types of ecosystems, preferring to burrow in soil, sand or sediment both on land and in the ocean. An estimated 17,000 species of annelids are known to exist worldwide.Full Answer >
Annelids eat with a mouth that is located on the underside of the head. The mouth connects to an unsegmented gut that runs the length of the worm. The gut terminates at the anus, located at in the pygidium area at the end of the worm.Full Answer >
Earthworms are native to Europe and have spread in range to western and central Asia, as well as North America. They typically can be found in two ecophysical areas: above or below the soil. Above-soil earthworms consume decaying vegetable matter. Sub-soil earthworms create either horizontal or vertical burrows.Full Answer >
Earthworms do not have eyes, but they are equipped with cells that can sense changes in the intensity of light as well as cells that can respond to and measure touch. Earthworms are very primitive organisms who do not need to depend on sight to feed as they spend their lives simply moving through the soil and getting their nutrients from it.Full Answer >