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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.
Most people think of leeches as nasty bloodsucking creatures with little or no. worth, and no interesting behaviors, let alone any parenting skills, but this. popular perception of them is way off the mark. A common misconception. about leeches is that there is only one kind of leech. In fact, there are between.