fluke 1 (flo͞ok) n. 1. Any of numerous parasitic flatworms, including the trematodes, some of which infect humans, and the monogeneans, which are chiefly ectoparasites of fish. 2. Any of various flatfishes …
The flukes Trematoda are a class of parasitic worms belonging to the phylum Platyhelminthes. One species, Leucochloridium macrostomum, Some are external parasites ectoparasites ; some attach themselves to internal organs endoparasites ; others are semi-external, attaching themselves to the lining of the mouth, to the gills, or to the cloaca the end of the digestive tract.
The symmetrical body of a fluke is covered with a noncellular cuticle. Muscular suckers on the ventral bottom surface, hooks, and spines are used for attachment. The body is solid and filled with a spongy connective tissue mesenchyme that surrounds all the body organs.
A circulatory system is absent. The digestive system consists of a simple sac with a mouth either at the anterior end or in the middle of the ventral surface.
An anus is usually absent, but some species have one or two anal pores. The nervous system consists of a pair of anterior ganglia, or nerve centres, and usually three pairs of lengthwise nerve cords. In some, however, the sexes are separate. Get a Britannica Premium subscription and gain access to exclusive content. The human diseases caused by them are known as schistosomiasis bilharziasis ; they affect millions of persons, particularly in Africa and east Asia.
The urinary blood fluke S. Eggs, laid in the veins, break through the vein wall into the bladder and are voided during urination. The larval fluke develops in the body of a snail chiefly of the genera Bulinus and Physopsis , the intermediate host.
The mature larva makes its way into the body of the final host, man, through the skin or the mouth. The intestinal blood fluke S. The eggs pass from the host with the feces. The larva enters the body of a snail any of several genera , the intermediate host, and returns to a human host through the skin. Snails of the genus Oncomelania are the intermediate host. The adult occurs in the veins of the small intestine.
Some eggs are carried in the bloodstream to various organs and may cause a variety of symptoms, including enlargement of the liver. Human hosts may die from severe infestations. Flukes of detrimental economic significance to man include the widely occurring giant liver fluke of cattle Fasciola hepatica and the Chinese, or Oriental, liver fluke Opisthorchis sinensis , or Clonorchis sinensis.
Man may become infested with this fluke by eating uncooked vegetables. The Chinese liver fluke infests a variety of mammals, including man. In addition to the snail as an intermediate host, the Chinese liver fluke infests fish as a second intermediate host before passing to the final host. The cat liver fluke, Opisthorchis felineus, which may also infest man as the final host, also requires a freshwater snail Bithynia leachii and a carp as its secondary intermediate hosts.
Rafferty , Editor.
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fluke definition: 1. something good that has happened that is the result of chance instead of skill or planning: 2…. Learn more.
fluke 1 (flo͞ok) n. 1. Any of numerous parasitic flatworms, including the trematodes, some of which infect humans, and the monogeneans, which are chiefly ectoparasites of fish. 2. Any of various flatfishes chiefly of the genus Paralichthys, especially the summer flounder. [Middle English, flounder, flatfish, from Old English flōc; see plāk- in Indo …
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Fluke, any member of the invertebrate class Trematoda (phylum Platyhelminthes), a group of parasitic flatworms that probably evolved from free-living forms millions of years ago. There are more than …
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