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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.
Leeches. Often feared for their reputation as bloodsuckers, leeches are another example of annelids common throughout the world. Most live in temperate climates, but some are found in other places, ranging from hot desert ponds to the icy waters of Antarctica.arthworms are probably the best known and most common of the annelids; more than 2,700 kinds of earthworms have been identified around the world. They range from no more than a half-inch long to many feet long; the largest recorded earthworm was 22 feet.