How do trematodes feed?

Asked By: Maksymilian Wilhelmsen | Last Updated: 3rd January, 2020
Category: medical health infectious diseases
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Trematodes are parasitic flatworms commonly known as flukes. These flattened oval or worm-shaped creatures feed off their hosts' blood using muscular, pumping mouths — as they have no anuses, their bodily wastes blurt out from their mouths as well.

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Likewise, people ask, how do trematodes reproduce?

Almost all flukes make both eggs and sperm. Blood flukes have separate sexes, and the adult females and males mate with each other. Flukes with a direct life cycle use only sexual reproduction. The entire life cycle occurs in one host, usually a mollusk.

Beside above, how does a person get flukes? A liver fluke is a parasitic worm. Infections in humans usually occur after eating contaminated raw or undercooked freshwater fish or watercress. After liver flukes have been ingested, they travel from your intestines to your bile ducts in your liver where they then live and grow.

Moreover, what does it mean when all trematodes are parasites?

Trematodes, also called flukes, cause various clinical infections in humans. The parasites are so named because of their conspicuous suckers, the organs of attachment (trematos means "pierced with holes"). All the flukes that cause infections in humans belong to the group of digenetic trematodes.

What are the characteristics of trematodes?

Trematodes are flattened oval or worm-like animals, usually no more than a few centimetres in length, although species as small as 1 millimetre (0.039 in) are known. Their most distinctive external feature is the presence of two suckers, one close to the mouth, and the other on the underside of the animal.

39 Related Question Answers Found

What is a fluke worm?

Fluke, also called blood fluke or trematode, 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 10,000 species of flukes.

What is the life cycle of trematode?

The life cycle of a typical trematode begins with an egg. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The hatchling is called a miracidium, a free-swimming, ciliated larva.

How are Cestodes transmitted?

Taenia solium cysticercosis or H nana can be transmitted in a direct cycle via ingestion of eggs from human feces. Echinococcus eggs from dog or fox fur cause human hydatid disease (humans are the intermediate host; canids are the definitive hosts).

What is the most common way to diagnose ascariasis?

Health care providers can diagnose ascariasis by taking a stool sample and using a microscope to look for the presence of eggs. Some people notice infection when a worm is passed in their stool or is coughed up. If this happens, bring in the worm specimen to your health care provider for diagnosis.

What stage of Schistosoma infects humans?


The schistosome eggs are excreted into the water system in the urine or faeces of an infected human. The eggs hatch to release the free-swimming larval stage of the parasite, called miracidia, into the surrounding water. The miracidia burrow into the tissue of a small, freshwater snail such as Biomphalaria.

Where do tapeworms live in humans?

Tapeworms are flat, segmented worms that live in the intestines of some animals. Animals can become infected with these parasites when grazing in pastures or drinking contaminated water. Eating undercooked meat from infected animals is the main cause of tapeworm infection in people.

Is a tapeworm a flatworm?

Tapeworm. Tapeworm, also called cestode, any member of the invertebrate class Cestoda (phylum Platyhelminthes), a group of parasitic flatworms containing about 5,000 species. The disease caused by tapeworms is known as cestodiasis (q.v.).

How do I get rid of trematodes?

Praziquantel is recommended when bithionol is not available. Bithionol is the drug of choice for Fasciola infections. The drug of choice in the treatment of fascioliasis is triclabendazole, a member of the benzimidazole family of anthelmintics.

What is a human infection caused by flukes called?

Liver flukes are parasitic worms that live in the bile ducts and the liver of infected animals. These parasites cause a disease called fascioliasis in people, cattle, and sheep. Although liver flukes can infect people in all parts of the world, they are most prevalent in developing countries.

How is schistosomiasis diagnosed?


Diagnosis. Schistosomiasis is diagnosed through the detection of parasite eggs in stool or urine specimens. Antibodies and/or antigens detected in blood or urine samples are also indications of infection. mansoni transmission areas, CCA (Circulating Cathodic Antigen) test can also be used.

How are parasitic trematodes adapted to their mode of life?

To lead a parasitic mode of life, the parasites have adapted themselves in such a way as to survive and adjust itself with the body environment of their host. Adaptation is a dynamic process of adjustment with the new environment for establishment, self regulation, self preservation and race continuation.

Is cestoda a parasite?

Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, known as tapeworms. Some cestodes are host-specific, while others are parasites of a wide variety of hosts.

What are Operculated eggs?

o·per·cu·lat·ed
Provided with a lid (operculum); denoting members of the mollusk class Gastropoda (snails), subclass Prosobranchiata (operculate snails), and the eggs of certain parasitic worms such as the digenetic trematodes (except the schistosomes) and the broad fish tapeworm, Diphyllobothrium latum.

Do trematodes have a digestive system?

Like a turbellarian, a trematode has a two-branched gut that extends throughout the body, but it doesn't have a very long pharynx. Many trematodes have no digestive system at all. Since many of them live inside the digestive systems of the infected animal, they can simply absorb pre-digested food from the animal.

How are tapeworms spread?


Tapeworms get into the body when someone eats or drinks something that's infected with a worm or its eggs. People can pass tapeworm eggs to others when they don't wash their hands after using the bathroom. Tapeworm eggs in feces can then spread into food or onto surfaces like doorknobs.

Why do trematodes lack sensory structures?

Trematodes have simple sensory organs around the mouth, but do not have some of the more complex sensory organs found in other flatworms, such as the eye spots of turbellarians. Trematodes expel undigested material through their mouth because they do not have an anus.

What trematodes are localized in the human intestine?

The most common human intestinal trematode is Fasciolopsis buski. The other important intestinal trematodes are Heterophyes heterophyes, Metagonimus yokogawai and Echinostoma spp.