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Concept
Hirudo medicinalis
Summary
Hirudo medicinalis, the European medicinal leech, is one of several species of leeches used as "medicinal leeches".
Other species of Hirudo sometimes also used as medicinal leeches include H. orientalis, H. troctina, and H. verbana. The Asian medicinal leech includes Hirudinaria manillensis, and the North American medicinal leech is Macrobdella decora.
Medicinal leech populations were severely reduced in many countries during the 19th century due to the high demand in medical contexts, and remain endangered in many countries today.
The general morphology of medicinal leeches follows that of most other leeches. Fully mature adults can be up to 20 centimeters in length, and are green, brown, or greenish-brown with a darker tone on the dorsal side and a lighter ventral side. The dorsal side also has a thin red stripe. These organisms have two suckers, one at each end, called the anterior and posterior suckers. The posterior is used mainly for leverage, whereas the anterior sucker, consisting of the jaw and teeth, is where the feeding takes place. Medicinal leeches have three jaws (tripartite) that resemble saws, on which are approximately 100 sharp edges used to incise the host. The incision leaves a mark that is an inverted Y inside of a circle. After piercing the skin, they suck out blood while injecting anticoagulants (hirudin). Large adults can consume up to ten times their body weight in a single meal, with 5–15 mL being the average volume taken. These leeches can live for up to a year between feedings.
Medicinal leeches are hermaphrodites that reproduce by sexual mating, laying eggs in clutches of up to 50 near (but not under) water, and in shaded, humid places. A study done in Poland found that medicinal leeches sometimes breed inside the nests of large aquatic birds, noting that conservation efforts directed at bird habitats may also indirectly help preserve dwindling leech populations.
Their range extends over almost the whole of Europe and into Asia as far as Kazakhstan and Uzbekistan.
Official source
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