Trematoda

(Redirected from Fluke)
Jump to: navigation, search
Trematoda
Botulus microporus, a giant digenean parasite from the intestine of a lancetfish
Botulus microporus, a giant digenean parasite from the intestine of a lancetfish
Scientific classification
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Trematoda
Rudolphi, 1808
Subclasses

Aspidogastrea
Digenea

WikiDoc Resources for

Trematoda

Articles

Most recent articles on Trematoda

Most cited articles on Trematoda

Review articles on Trematoda

Articles on Trematoda in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Trematoda

Images of Trematoda

Photos of Trematoda

Podcasts & MP3s on Trematoda

Videos on Trematoda

Evidence Based Medicine

Cochrane Collaboration on Trematoda

Bandolier on Trematoda

TRIP on Trematoda

Clinical Trials

Ongoing Trials on Trematoda at Clinical Trials.gov

Trial results on Trematoda

Clinical Trials on Trematoda at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Trematoda

NICE Guidance on Trematoda

NHS PRODIGY Guidance

FDA on Trematoda

CDC on Trematoda

Books

Books on Trematoda

News

Trematoda in the news

Be alerted to news on Trematoda

News trends on Trematoda

Commentary

Blogs on Trematoda

Definitions

Definitions of Trematoda

Patient Resources / Community

Patient resources on Trematoda

Discussion groups on Trematoda

Patient Handouts on Trematoda

Directions to Hospitals Treating Trematoda

Risk calculators and risk factors for Trematoda

Healthcare Provider Resources

Symptoms of Trematoda

Causes & Risk Factors for Trematoda

Diagnostic studies for Trematoda

Treatment of Trematoda

Continuing Medical Education (CME)

CME Programs on Trematoda

International

Trematoda en Espanol

Trematoda en Francais

Business

Trematoda in the Marketplace

Patents on Trematoda

Experimental / Informatics

List of terms related to Trematoda

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Overview

The Trematoda is a class within the phylum Platyhelminthes that contains two groups of parasitic worms, commonly referred to as flukes.

Taxonomy and biodiversity

The Trematoda are estimated to include 18 000[1] to 24 000[2] species, and are divided into two subclasses. Nearly all trematodes are parasites of molluscs and vertebrates. The smaller Aspidogastrea, comprising about 100 species, are obligate parasites of molluscs and may also infect turtles and fishes, including cartilaginous fishes. The Digenea, which constitute the majority of trematode diversity, are obligate parasites of both molluscs and vertebrates, but do not occur in cartilaginous fishes. Crepidostomum sp. do occur in Lake Sturgeon.

Formerly the Monogenea were included in the Trematoda on the basis that these worms are also vermiform parasites, but modern phylogenetic studies have raised this group to the status of a sister class within the Platyhelminthes, along with the Cestoda.

Etymology

Trematodes are commonly referred to as flukes. This term can be traced back to the Saxon name for flounder, and refers to the flattened, rhomboidal shape of the worms.

The flukes can be classified into two groups, on the basis of the system which they infect in the vertebrate host. Tissue flukes infect the bile ducts, lungs, or other biological tissues. This group includes the lung fluke, Paragonimus westermani, and the liver flukes, Clonorchis sinensis and Fasciola hepatica. Blood flukes inhabit the blood in some stages of their life cycle. Blood flukes include species of the genus Schistosoma.

Life cycles

All trematodes infect molluscs and most have a complex life cycle involving other hosts. Most trematodes are monoecious and alternately reproduce sexually and asexually. The two main exceptions to this are the Aspidogastrea, which have no asexual reproduction, and the schistosomes, which are dioecious.

In the definitive host, in which sexual reproduction occurs, eggs are commonly shed along with host feces. Eggs shed in water release free-swimming larval forms that are infective to the intermediate host, in which asexual reproduction occurs.

References

  1. Cribb, T.H., R.A.Bray, D.T.J. Littlewood, S.P. Pichelin and E.A. Herniou. 2001. The Digenea in D.T.J. Littlewood and R.A. Bray, eds. Interrelationships of the Platyhelminthes pp 168-185. Taylor & Francis, London.
  2. Poulin, R. and S. Morand. 2004. Parasite Biodiversity. Smithsonian Books, Washington. 216 pp.
cs:Motolice

de:Saugwürmerhr:Metilji it:Trematoda lv:Trematodes mk:Метили nl:Trematodano:Iktersimple:Trematoda sk:Motolice sl:Sesači sr:Метиљ


Navigation WikiDoc | WikiPatient | Up To Date Pages | Recently Edited Pages | Recently Added Pictures

Table of Contents In Alphabetical Order | By Individual Diseases | Signs and Symptoms | Physical Examination | Lab Tests | Drugs

Editor Tools Become an Editor | Editors Help Menu | Create a Page | Edit a Page | Upload a Picture or File | Printable version | Permanent link | Maintain Pages | What Pages Link Here
There is no pharmaceutical or device industry support for this site and we need your viewer supported Donations | Editorial Board | Governance | Licensing | Disclaimers | Avoid Plagiarism | Policies
Linked-in.jpg