Leech 151757 225727459 2008-07-15T02:55:12Z Tj9991 192259 Reverted edits by [[Special:Contributions/209.162.35.247|209.162.35.247]] to last version by 64.39.250.108 (using [[WP:HG|Huggle]]) {{underconstruction|date=May 2008}} {{otheruses}} {{AnimalsCleanup}} {{Taxobox | image = Leech-china.JPG | image_width = 220px | image_caption = A leech in China | regnum = [[Animal]]ia | subregnum = [[Eumetazoa]] | superphylum = [[Lophotrochozoa]] | phylum = [[Annelida]] | classis = [[Clitellata]] | subclassis = '''Hirudinea''' | subclassis_authority = [[Jean-Baptista Lamarck|Lamarck]], 1818 | subdivision_ranks = [[Infraclass]]es | subdivision = [[Acanthobdellidea]]<br /> [[Euhirudinea]]<br/> (but see [[#Systematics and taxononytaxonomy|below]]) }} '''Leeches''' are [[annelid]]s comprising the [[subclass]] '''Hirudinea'''. There are fresh water, terrestrial, and marine leeches. Like the [[Oligochaeta]], they share the presence of a [[clitellum]]. Like [[earthworms]], leeches are [[hermaphrodite]]s. The [[European Medical Leech]] (''Hirudo medicinalis'') and some [[congener]]s as well as some other [[species]] have been used for clinical [[bloodletting]] for thousands of years. But most leeches do not feed on blood, but hunt small [[invertebrate]]s, which they devour whole. Haemophagic leeches attach to their hosts and remain there until they become full, at which point they fall off to digest. Leeches' bodies are composed of 34 segments. They all have an anterior (oral) sucker formed from the first six segments of their body, which is used to connect to a host for feeding, and also release an anesthetic to prevent the host from feeling the leech. They use a combination of mucus and suction (caused by concentric muscles in those six segments) to stay attached and secrete an anti-clotting enzyme into the host's [[Blood|blood stream]]. Some species of leech will nurture their young, providing food, transport, and protection, which is unusual behavior in an invertebrate. ==Systematics and taxonomy== [[Image:Americobdella.jpg|thumb|right|This giant ''[[Americobdella]]'' leech from southern Chile is an ancient arhynchobdellid. It is a [[predator]], feeding on [[earthworm]]s which it swallows whole.]] The leeches are presumed to have evolved from certain [[Oligochaeta]], most of which feed on [[detritus (biology)|detritus]]. However, some species in the [[Lumbriculidae]] are predatory and have similar adaptations as found in leeches. Consequently, the [[systematics]] and [[taxonomy]] of leeches is in need of review. While leeches form a [[clade]], the remaining oligochetes are not their [[sister taxon]] but a diverse [[paraphyletic]] group containing some lineages that are closely related to leeches, and others that are far more distant. There is some dispute as to whether Hirudinea should be a class itself, or a subclass of the [[Clitellata]]. The resolution mainly depends on the eventual fate of the oligochaetes, which as noted above do not form a natural group as traditionally circumscribed. Another possibility would be to include the leeches in the [[taxon]] Oligochaeta, which would then be ranked as a class and contain most of the clitellates. The [[Branchiobdellida]] are leechlike clitellates which were formerly included in the Hirudinea but are apparently just rather close relatives. The more primitive [[Acanthobdellidea]] are often included with the leeches, but some authors treat them as a separate clitellate group. True leeches, of the infraclass [[Euhirudinea]], have both anterior and posterior suckers and are divided into two groups: * [[Rhynchobdellida]] (or Rhynchobdellae): jawless leeches, armed with a muscular straw-like proboscis puncturing organ in a retractable sheath. * [[Arhynchobdellida]] (or Arhynchobdellae): Leeches which lack a proboscis and which may or may not have jaws armed with teeth. True leeches, of the subclass Euhirudine, with both anterior and posterior suckers, are divided into two groups *Rhynchobdellae: "jawless" leeches, armed with a muscular straw-like proboscis puncturing organ in a retractable sheath. The Rhynchobdellae consist of two families: The Glossiphoniidae (flattened leeches wth a poorly defined anterior sucker) and the Piscicolidae (have cylindrical bodies and a usually well-marked, bell-shaped, anterior sucker). The Glossiphoniidae live in fresh-water habitats; the Pisciolidae are found in sea-water habitats. *Arhynchobdellid: Leeches which lack a proboscis and which may or may not have jaws armed with teeth. Arhynchobellids are divided into two orders: Gnathobdellae and Pharyngobdellae Gnathobdelae: In this order of "jawed" leeches, armed with chips, is found the quintessential leech: the European medical (bloodsucking) leech, Hirudo medicinalis. It has a tripartite-jaw filled with hundreds of tiny sharp teeth. The incision mark left on the skin by the Europan medical leech is an inverted Y inside a circle. Its North American counterpart is Macrobdela decora, a much less efficient medical leech. Within this order, the family Hirudidae is characterized by aquatic leeches and the family Haemadipsidae by terrestrial leeches. In the latter are Haemadipsa sylvestris, the Indian leech and Haemadipsa zeylanica (Yamabiru), the Japanse Mountain or Land leech.<ref>^ http://www.youtube.com/watch?v=ye4N2ZeJESA Video Japanese Mounain leech </ref>. Pharyngobdellae: These so called worm-leeches consist of freshwater or amphibious leeches that have lost the ability to penetrate a host's tissue and suck blood. They are carnivorous and equipped with a relatively large, toothless, mouth to ingest worms or insect larvae, which are swallowed whole. The Pharyngobdella have six to eight pairs of eyes, as compared with five pairs in Gnathobdelliform leeches, and include three related families. The Erpobdellidae are some species from freshwater habitats. ==Reproduction== Leeches are [[hermaphrodite]]s, meaning they are organisms that have both female and male [[Sex organ|reproductive organs]] ([[ovary|ovaries]] and [[testicle|testes]] respectively). They reproduce by reciprocal fertilization and sperm transfer occurs during copulation.The leech exercising the role of the male will grow a sperm sack near the end of their tail, and the leech playing the female will bite it off, thus reproducing. Similarly to the earth worms, leeches also use a clitellum to hold their eggs and secrete the cocoon. During reproduction leeches utilize hyperdermic injection of their sperm. They use a spermatophore which is a structure containing the sperm. Once next to another leech, the two will line up with their anterior side opposite the others posterior. The leech then shoots the spermatophore into the clitellur region of the opposing leech where its sperm will make its way to the female reproductive parts. ==Nutrition of leeches==<!-- this focusses too much on haemophagouos leeches --> Starting from the anterior sucker is the jaw, the [[Pharynx]] which extends to the [[crop (anatomy)|crop]], which leads to the Intestinum, where it ends at the posterior sucker. The crop is a type of stomach that works like an expandable storage compartment. The crop allows a leech to store blood up to five times its body size; because of this ability to hold blood without the blood decaying, due to bacteria living inside the crop, medicinal leeches only need to feed two times a year. It was long thought that bacteria in the gut carried on [[digestion]] for the leech instead of endogenous enzymes which are very low or absent in the intestine. Relatively recently it has been discovered that all leeches and leech species studied do produce endogenous intestinal exopeptidases which can unlink free terminal-end [[amino acid]]s, one amino acid monomer at a time, from a gradually unwinding and degrading protein polymer. However, unzipping of the protein can start from either the amino (tail) or carboxyl (head) terminal-end of the [[Protein|protein molecule]]. It just so happens that the leech [[exopeptidase]] (arylamidases), possibly aided by proteases from endosymbiotic bacteria in the intestine, starts from the tail or amino protein, free-end, slowly but progressively removing many hundreds of individual terminal amino acids for resynthesis into proteins that constitute the leech. Since leeches lack [[endopeptidases]], the mechanism of protein digestion can not follow the same sequence as it would in all other animals where [[exopeptidases]] act sequentially on peptides produced by the action of [[endopeptidases]]. [[Exopeptidases]] are especially prominent in the common North American worm-leech Erpobdella punctata. This evolutionary choice of exopeptic digestion in Hirudinea distinguishes these carnivorous clitellates from Oligochaeta. Deficiency of [[digestive enzyme]]s (except exopeptidases) but more importantly deficiency of vitamins, B complex for example, in leeches is compensated for by enzymes and vitamins produced by endosymbiotic microflora. In ''Hirudo medicinalis'' these supplementary factors are produced by an obligatory [[Symbiosis|symbiotic relationship]] with two bacterial species, ''Aeromonas veronii'' and a still uncharacterized ''Rikenella'' species. Non-bloodsucking leeches such as ''[[Erpobdella punctata]]'' are host to three bacterial symbionts, ''[[Pseudomonas]]'' sp., ''[[Aeromonas]]'' sp., and ''[[Klebsiella]]'' sp. (a slime producer). The bacteria are passed from parent to offspring in the cocoon as it is formed. ==Leech bites== ===Effects=== [[Image:Attached Leech.jpg|thumb|A Borneo leech. Note how the leech curls and fattens as it fills with [[blood]].]] Though all species of leeches feed on blood, not all species can bite; 90% of them solely feed off decomposing bodies and open wounds of amphibians, reptiles, waterfowl, fish, and other mammals (including, but not limited to, humans). A leech attaches itself when it bites, and it will stay attached until it has had its fill of blood. Due to an [[anticoagulant]] ([[hirudin]]) that leeches [[secrete]], bites may bleed more than a normal wound after the leech is removed. The effect of the anticoagulant will wear off several hours after the leech is removed and the wound is cleaned. Leeches normally carry parasites in their [[Gastrointestinal tract|digestive tract]] which cannot survive in humans and do not pose a threat. However, bacteria, viruses, and parasites from previous blood sources can survive within a leech for months, and may be retransmitted to humans. A study found both [[HIV]] and [[hepatitis|hepatitis B]] in African leeches from [[Cameroon]].<ref name="nehili">Nehili, M., C. Ilk, H. Mehlhorn, K. Ruhnau, W. Dick, M. Njayou. [http://www.ncbi.nlm.nih.gov/sites/entrez?Db=PubMed&Cmd=ShowDetailView&TermToSearch=8073013 Experiments on the possible role of leeches as vectors of animal and human pathogens: a light and electron microscopy study]. ''(Abstract Only).'' ''Parasitology Research''. 1994;80(4):277-90, PubMed ID 8073013. Retrieved on [[2007]]-[[07-28]].</ref> ===Removal=== One recommended method of removal is using a fingernail to break the seal of the oral sucker at the anterior end (the smaller, thinner end) of the leech, repeating with the posterior end, then flicking the leech away. As the fingernail is pushed along the person's skin against the leech, the suction of sucker's seal is broken, at which point the leech should detach its jaws.<ref name=timesonline>[http://driving.timesonline.co.uk/tol/life_and_style/driving/article600016.ece The Knowledge: Removing a leech] Times Online. [[2006]]-[[10-15]]. Retrieved on [[2007]]-[[07-28]].</ref><ref name=worstcase>[http://www.worstcasescenarios.com/scenario.htm?scenarioid=22 Scenario Archive, Travel Survival: How to Remove a Leech] Worst Case Scenarios. Retrieved on [[2007]]-[[07-28]].</ref> A common but medically inadvisable technique to remove a leech is to apply a flame, lit cigarette, salt, soap, or caustic chemical such as alcohol, vinegar, lemon juice, insect repellent, [[heat rub]], or certain carbonated drinks. These cause the leech to regurgitate its stomach contents into the wound and quickly detach. The vomit may carry disease and increases the risk of infection.<ref name="timesonline" /><ref name="worstcase" /><ref name=poisonscentre>[http://www.rch.org.au/poisons/stings.cfm?doc_id=3693 Victorian Poisons Information Centre: Leeches] Victorian Poisons Information Centre. Retrieved on [[2007]]-[[07-28]].</ref> Simply pulling a leech off by grasping it can also cause regurgitation, and adds risks of further tearing the wound, and leaving parts of the leech's jaw in the wound, which can also increase the risk of infection. An externally attached leech will detach and fall off on its own when it is satiated on blood, usually in about 20 minutes (but will stay there for as long as it can),<ref name="poisonscentre" /> while internal attachments, such as nasal passage or vaginal attachments, are more likely to require medical intervention.<ref>Ibrahim, Adibah, Hakim Bilal Gharib, and Mohd. Nizar Bidin. [http://www.ispub.com/ostia/index.php?xmlFilePath=journals/ijgo/vol2n2/leech.xml An Unusual Cause Of Vaginal Bleeding: A Case Report] The Internet Journal of Gynecology and Obstetrics. 2003. Vol. 2, No. 2, ISSN: 1528-8439. Retrieved on [[2007]]-[[07-28]].</ref><ref>[http://www.abc.net.au/news/stories/2005/04/11/1342694.htm Blood-sucker gets up woman's nose] Reuters via ABC News. [[2005]]-[[04-11]]. Retrieved on [[2007]]-[[07-28]].</ref>. ===Treatment=== After removal or detachment, the wound should be cleaned with soap and water, and bandaged. Bleeding may continue for some time, due to the leech's anti-clotting enzyme. Applying pressure can reduce bleeding, although blood loss from a single bite is not dangerous. The wound normally itches as it heals, but should not be scratched as this may complicate healing and introduce other infections. An [[antihistamine]] can reduce itching, and applying a cold pack can reduce pain or swelling. Some people suffer severe allergic or [[anaphylaxis|anaphylactic reactions]] from leech bites, and require urgent medical care. Symptoms include red blotches or an itchy rash over the body, swelling away from the bitten area (especially around the lips or eyes), feeling faint or dizzy, and difficulty breathing.<ref name="poisonscentre" /> ===Prevention=== There is no guaranteed method of preventing leech bites in leech-infested areas. The most reliable method is to cover exposed skin. The effect of [[insect repellent]]s is disputed, but it is generally accepted that strong (maximum strength or tropical) insect repellents do help prevent bites. Leech socks can be helpful in preventing bites when the full body will not be at risk of contact with leeches. Leech socks are pulled over the wearer’s trousers to prevent leeches reaching the exposed skin of the legs and attaching there or climbing towards the torso. The socks are generally a light color that also makes it easier to spot leeches climbing up from the feet and looking for skin to attach to. There are many people who would inject themselves with mobile injections of insects and rose [[Home remedy|home remedies]] to help prevent leech bites. Many people have a great deal of faith in these methods, but none of them has been proven to have much or any effect.{{Fact|date=April 2008}}Some more home remedies include: a dried residue of bath soap, tobacco leaves between the toes, pastes of salt or [[Sodium bicarbonate|baking soda]], citrus juice, and [[Eucalyptus|eucalyptus oil]]. Diluted [[Calcium hydroxide]] may also be used as a repellent, but may be damaging or irritating to the skin. Leeches can be found most on lake floors, under rocks, and in thick weed beds. ==See also== * [[Bloodletting]] &ndash; a popular use of leeches * [[Tempest Prognosticator]] &ndash; the application of leeches in a [[barometer]] * [[Picklescott's leech]] ==References== {{reflist}} ==Further reading== * Sawyer, Roy T. 1986. ''Leech Biology and Behaviour''. Vol 1-2. [[Oxford University Press|Clarendon Press]], Oxford ==External links== {{Commons|Hirudinea}} {{Wikispecies|Hirudinea}} {{Wikibookspar|Dichotomous Key|Hirudinea}} * [http://www.hirudolab.com Hirudolab] * [http://www.leechesturkey.com Turkey leeches] * [http://www.amonline.net.au/factsheets/leeches.htm Leech fact sheet], [[Australian Museum]] * [http://www.glooskapandthefrog.org/leach.htm North American leeches] * [http://www.wildmadagascar.org/overview/leeches.html How to remove a leech] * [http://www.disgustingly-healthy.com Biotherapy with leeches and maggots] [[Category:Annelids]] [[gn:Ysope]] [[bg:Пиявици]] [[cs:Pijavice]] [[da:Igler]] [[de:Egel]] [[et:Kaanid]] [[es:Hirudinea]] [[fr:Hirudinea]] [[ko:거머리]] [[id:Lintah]] [[is:Iglur]] [[it:Hirudinea]] [[he:עלוקה]] [[lb:Bluttsëffer]] [[lt:Dėlės]] [[hu:Pióca]] [[mk:Пијавици]] [[nl:Bloedzuiger (worm)]] [[ja:ヒル (動物)]] [[nn:Igle]] [[uz:Zuluk]] [[pl:Pijawki]] [[pt:Sanguessuga]] [[qu:Yawar ch'unqaq]] [[ru:Пиявки]] [[simple:Leech]] [[sk:Pijavice]] [[sl:Pijavke]] [[sr:Пијавице]] [[fi:Juotikkaat]] [[sv:Iglar]] [[te:జలగలు]] [[th:ปลิง]] [[vi:Đỉa]] [[tr:Sülük]] [[uk:П'явки]] [[zh:蚂蟥]]