Difference between revisions of "Dicrocoelium dendriticum"

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{{Taxobox
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|backcolour =
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|name              =''Dicrocoelium dendriticum
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|linkpage =Parasites
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|kingdom            =Animalia
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|linktext =PARASITES
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|phylum            =Platyhelminthes
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|pagetype=Bugs
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|class              =[[Trematodes|Trematoda]]
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|sublink1=Trematodes
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|sub-class          =
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|subtext1=TREMATODES
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|order              =Diagiorchiida
 
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|super-family      =
 
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|family            =Dicrocoeliidae
 
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|sub-family        =
 
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|genus              =Dicrocoelium
 
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|species            ='''''D. dendriticum'''''
 
 
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}}
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<br>
  
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Also known as: '''''Dicrocoelium lanceolatum — Small lanceolate fluke
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== ''Dicrocoelium dendriticum'' ==
 
[[Image:Dicrocoelium dendriticum.jpg|thumb|right|150px|''Dicrocoelium dendriticum'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
 
[[Image:Dicrocoelium dendriticum.jpg|thumb|right|150px|''Dicrocoelium dendriticum'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
 
[[Image:Dicrocoelium dendriticum adult.jpg|thumb|right|150px|''Dicrocoelium dendriticum'' adult from horse faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
 
[[Image:Dicrocoelium dendriticum adult.jpg|thumb|right|150px|''Dicrocoelium dendriticum'' adult from horse faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
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*This is a small fluke (<1.5cm) found in the bile ducts of ruminants and some other herbivores
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==Hosts==
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*The flukes migrate directly up the common bile duct to reach the bile ducts within the liver
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'''Intermediate hosts''': Land snails, mainly ''Zebrina detrita'' within Europe. Brown ants of the genus ''Formica'' are also required for completion of the life cycle.
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**They are therefore much less pathogenic than ''Fasciola'' (which burrow through the liver parenchyma)
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*''Dicrocoelium'' is rare in Britain, occurring mainly in the Hebrides, but is common in Europe
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'''Definitive hosts''': ''D. dendriticum'' is most commonly seen in sheep, cattle, deer, and goats, but is occasionally seen in horses and pigs.
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**Small dark-brown eggs are shed in faeces
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**These contain a miracidium
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==Identification==
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**If ingested by a land snail, the flukes develop, forming cercariae
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The parasite is of the class [[Trematodes|Trematoda]].  The adults measure anything between 6mm and 1.0cm long, and are semi transparent.
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**These are excreted by the snails in slime-balls, which are collected and eaten by wood-ants
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The eggs are small dark-brown and are shed in the faeces by the infected host.
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**Metacercariae form inside the ants
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**The final host is infected when ants are eaten at grazing
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==Life Cycle==
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**The presence of metacercariae in the nerve ganglia of the ants makes them revert to a primitive behaviour pattern, whereby they cling onto herbage overnight instead of retreating to the nest enhancing the likelihood of being eaten by grazing animals
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After mating, the eggs are excreted in the faeces.  The first intermediate host, the snail, eats the faeces and ingests the infective larvae.  The larvae then grow and develop in the host. The larvae are then extruded in the slime.  This phase requires around 3 months for completion.
 
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The slime balls are then ingested by the '''ant''', along with the developing larvae, known as '''cercariae'''.  In the ant they mature into '''metacercariae'''.  The presence of metacercariae in the nerve ganglia of the ants makes them revert to a primitive behaviour pattern, whereby they cling onto herbage overnight instead of retreating to the nest enhancing the likelihood of being eaten by grazing animals.
 
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Infection of the definitive host is via ingestion of ants, mainly on the pasture. The metacercariae moult into immature flukes and migrate directly up the bile duct into the liver.
 
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See also [[Trematodes - Overview|general trematode information and life cycle]].
 
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{{Learning
 
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|flashcards = [[Trematodes_Flashcards|Trematodes Flashcards]]
 
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|literature search =[http://www.cabdirect.org/search.html?rowId=1&options1=AND&q1=%22Dicrocoelium+dendriticum%22&occuring1=title&rowId=2&options2=OR&q2=%22Dicrocoelium+lanceolatum%22&occuring2=title&rowId=3&options3=AND&q3=&occuring3=freetext&x=56&y=12&publishedstart=yyyy&publishedend=yyyy&calendarInput=yyyy-mm-dd&la=any&it=any&show=all ''Dicrocoelium dendriticum'' publications]
 
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{{review}}
 
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{{OpenPages}}
 
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[[Category:Trematodes]]
 
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[[Category:Expert_Review]]
 

Revision as of 23:02, 11 January 2009

Infectious agents and parasitesWikiBugs Banner.png
PARASITES
TREMATODES



Dicrocoelium dendriticum

Dicrocoelium dendriticum - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona
Dicrocoelium dendriticum adult from horse faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona
  • This is a small fluke (<1.5cm) found in the bile ducts of ruminants and some other herbivores
  • The flukes migrate directly up the common bile duct to reach the bile ducts within the liver
    • They are therefore much less pathogenic than Fasciola (which burrow through the liver parenchyma)
  • Dicrocoelium is rare in Britain, occurring mainly in the Hebrides, but is common in Europe
    • Small dark-brown eggs are shed in faeces
    • These contain a miracidium
    • If ingested by a land snail, the flukes develop, forming cercariae
    • These are excreted by the snails in slime-balls, which are collected and eaten by wood-ants
    • Metacercariae form inside the ants
    • The final host is infected when ants are eaten at grazing
    • The presence of metacercariae in the nerve ganglia of the ants makes them revert to a primitive behaviour pattern, whereby they cling onto herbage overnight instead of retreating to the nest enhancing the likelihood of being eaten by grazing animals
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