Annelids

= ANNELIDS =



= Phylum: Annelida =
 * =﻿They appear to have ringlike body segments. =
 * An annelid's body is divided into segments that are seperated by internal walls. Some of these segments carry out different functions for the annelid. These funtions range from antennae, eyes, and other sensory organs.
 * Many annelids have setae (bristles) attached to a segment.



 
 * Annelids have a true coelem that is lined with tissue from the mesoderm.
 * Types of annelids can range from filter feeders to predators.


 * Annelids get their food using a pharynx.
 * The majority of these animals have a closed circulatory system.
 * Annelids that live in water breathe through gills. Non-aquatic annelids receive and give off oxygen and carbon dioxide through their skin.


 * The n﻿ervous system of an annelid consists of a brain and several well-developed nerve cords.
 * The majority amount of annelids reproduce sexually.

There are three classes of annelids.

<span style="color: #ad8dce; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;"> <span style="color: #ad8dce; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">
 * <span style="color: #ad8dce; font-family: Tahoma,Geneva,sans-serif; font-size: 110%;">﻿The 1st class, **Oligochaetes** contain organisms like earthworms. The organisms in this class live either in freshwater or soil.




 * The 2nd class, **Hirudinea** contains species like leeches. Leeches are parasites that suck blood from their hosts. Furthermore, leeches can be used for medical purposes.


 * The 3rd class, Polchaetes include species like sandworms and bloodworms. These types of annelids are aquatic.