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Of the 650 species of leech listed, Hirudo medicinalis is one of the most extensively studied. This annelid from the subclass Hirudinea has 2 suckers, one housing the mouth and its 3 jaws. It lives mainly in the stagnant waters of marshes and ponds. When it comes to reproduction, the animal is a hermaphrodite. Inseminated leeches lay their eggs during the spring and summer months, outside the water, with cocoons containing as many as thirty young.
Pretty much all over the world in/around any muddy water in generally rural areas. They are mostly found in Asia and South America, but can be found as far north as Iceland... Addition: Most leeches live in freshwater, but some species live on land and some in salt water. Mikey Ennis.