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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.
(Erpobdella obscura) Fishing with Ribbon leeches is very popular in the northern part of the United States. In Wisconsin there are several species of fish like walleyes, bass, perch, bluegill, and crappie that seem to like eating leeches. Some anglers swear by leeches and say they are the only thing thats working. Leeches are a great alternative to nightcrawlers. All leeches have 2 sucking discs (one at each end).