Worms are in three phyla: Annelida, Nematoda and Platyhelminthes
Earthworms are in one phyla: Annelida
Annelida- coelum
Nematoda- A cavity between the digestive tract and the body wall. It develops from the blastocoel and is called a pseudocoel
Platyhelminthes- bilateral
Clitellum- The clitellum secretes a mucus which helps keep the worms together when exchanging sperm (copulation). The clitellum eventually slides off and is a cocoon for the new worms.
Oviducts- Where the eggs are stored.
Prostomium- It covers the mouth and is used to dig through the soil.
Seminal Receptacles- Sperm that is received is stored here.
Seminal Vesicles- Sperm is made here.
Setae- Small bristles that help the earthworm move by providing traction.
Nephridium- Removes metabolic wastes.
Crop- After food comes through the esophagus it passes through here. Food can be stored here before it passes through the digestive tract.
Gizzard- Food is ground down in here so it can be digested.
Septa- Thread like structures that hold the skin to the organs and separtate the segments.
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