Examples of Nematodes 

Hookworms- infects 700 million animals/humans, found in moist areas such as tropics and sub-tropics

Pinworms- birds, reptlies, amphibians, and mammals each have their own species of pinworms

Heartworms- shorter lifespan in cats than dogs 

http://www.virginmedia.com/images/hookworm.jpg

 

Roundworms- one type can reach 43 feet and infect sprem whales

Ascaris- looks like an earthworm, infects human's intestinal tract. Methods to treat Ascaris infections were found on a 3500 year old Egyptial scroll found in a tomb

 
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