Phylum: Annelida
The Annelid phylum consist with over 22,000 different species. The phylum is mostly made up from segmented worms, such as earthworms, rag worms and leeches.They can be found abundantly in moist areas. They tend to be long and are externally divided into segments by annuli.
Earth Worms
The Earthworm can be commonly found underground feeding on dead matter. They are one of the worlds organic ways of recycling. They breathe the same way the Nematoda do, they breathe through their skin. The Earthworm contains a moist layer of skin around it, which this necessary for it to take in oxygen. They can only travel in moist environmental, such as damp soil. That is why they only surface after a rainy day or at night, where the air is moist.
Rag Worms
The Ragworm tends to live underwater. The Ragworms lack gills and lungs they take in oxygen by diffusion. Just as the earthworms, they use the surface of their body to absorb oxygen and release carbon dioxide as waste.
Leech
The Leech is known for making a living out of blood sucking. They are used in medical procedures to help those that are ill. The leech can be found in still water, such as ponds and small lakes. It has no lungs, nor gills of any sort, but uses its skin to take in oxygen. The leech uses the method known as diffusion to exchange oxygen with carbon dioxide.