The word Annelida is derived from the Latin word annelus meaning small ring and eidos meaning shape. Animal bodies that are triploblastic, cylindrical, ring-like segments or metameres are called Annelida. The animals of this phase are known as ringworms or segmented worms. Phlebotomy is the process in which a starved leech is attached to the body to suck the contaminated blood from the body. The number of species in this category is about 17,338. Lamark (1809) identified soft-bodied animals as Annelida.