The Amazon Basin harbors an amazing amount of biodiversity. Covering some 7 million square kilometers 2. Case in point: The Candiru. Sometimes, these organisms are humans. These spines extend into the host, lodging the candiru firmly in place.
BBC - Earth - Would the candiru fish really eat your genitals?
Suddenly you feel it. Also known as the toothpick or vampire fish, this little river monster has swum up your penis and lodged itself in position using its umbrella like spines. The candiru Vandellia cirrhosa is a tiny catfish measuring just 3 to 5 cm in length. It is also known as the toothpick fish on account of its slender shape. The candiru is a parasite of larger fish, feeding off the blood from their gills. However, it is now believed they hunt by sight.
This fish is called the candiru and is a member of the genus Vandellia. The candiru is found in the Amazon region of South America and is a type of catfish. The fish is actually parasitic.
Schistosomiasis , also known as snail fever and bilharzia ,  is a disease caused by parasitic flatworms called schistosomes. The disease is spread by contact with fresh water contaminated with the parasites. Methods to prevent the disease include improving access to clean water and reducing the number of snails. Schistosomiasis affected about million people worldwide in