Monogeneans are important pathogenic parasites of captured captive fishes and .. characteristic of the Class Monogenea, but do present an operculum that. members of the flatworm phylum Platyhelminthes, class Monogenea. Monogenea are small parasitic flatworms mainly found on skin or gills. Major Classes – will consider each in detail: 1. Class Trematoda a. Subclass Aspidobothrea b. Subclass Digenea. 2. Class Monogenea. 3. Class Cestoidea.

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By using this site, you agree to the Terms of Use and Privacy Policy. Their most distinctive external feature is the presence of two suckersone close to the mouth, and the other on the underside of the animal.

In other projects Wikimedia Commons Wikispecies. Institute of Food and Agricultural Sciences. Their soft, flattened bodies are composed of three layers-the ectoderm, endoderm, and mesoderm.

Flatworms – Class Turbellaria, Class Monogenea, Class Trematoda, Class Cestoidea

Content on this website is from high-quality, licensed material originally published in print form. Citing this material Please include a link to this page if you have found this material useful for research or writing monnogenea related article. The Monogenea are mainly ectoparasites of fish and have a simple life-cycle involving only one host; whereas the Trematoda are mainly endoparasitic and have a more complicated life-cycle involving more than one host.

These worms are bilaterally symmetrical, meaning that their two sides reflect each other.

A fluke must live in two or more hosts during its lifetime because its developmental needs are different than its adult needs. Although the excretion of nitrogenous waste occurs mostly through the tegumenttrematodes do possess an excretory systemwhich is instead mainly concerned with osmoregulation. Schistosoma mansoni above causes the disease shistosomiasis which infects around million people world-wide, causing body pain, anaemia and dysentery, and kills over every year. 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.


The posterior opisthaptor with its hooks, anchors, clamps etc.

Polyopisthocotyleans are almost exclusively gill-dwelling blood feeders, whereas monopisthocotyleans may live on the gills, skin, and fins. The anterior structures are collectively termed the prohaptorwhile the posterior ones are collectively termed the opisthaptoror simply haptor.

Other diseases are caused by members of the genus Choledocystus. The Trematoda are endoparasitic with a complicated life-cycle. There are usually two testeswith sperm ducts that join together on the underside of the front half of the animal.

In the photograph above of Taenia sp.

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Views Read Edit View history. No known monogeneans infect birdsbut one Oculotrema hippopotami infects mammalsparasitizing the eye of the hippopotamus. Infectious diseases Parasitic disease: The proglottids regularly mature and detach and are shed with the faeces of the host.

They usually have a recognizable head, which houses gravity and light-receptive organs, and eye spots. These embryos move mnogenea the brood sac and mature into cercaria.

Monogenea – Wikipedia

Some parasitologists divide the Monogenea into two or three subclasses based on the complexity of their haptor: Unsourced material may be challenged and removed. Monogeneans possess the simplest lifecycle among the parasitic platyhelminths. They lack circulatory and nonogenea systems and have only one opening that serves both as their anus and mouth. It is in the central body of the sporocyst where the casse replicates itself, producing lots of tiny embryos redia.

If a planaria is cut in half, the front half will grow a new tail section and the rear half will generate a new head.

The intermediate host is the fleaand the tapeworm passes into the cat or dog as they clean themselves by licking and biting. Almost all trematodes infect molluscs as the first host in the life cycleand most have a complex life cycle involving other hosts.


The primary host, where the flukes sexually reproduce, is a monogeena. Diseases and parasites in cod Diseases and parasites in salmon Disease in ornamental fish List of aquarium diseases.

Systematics Association Special Volume. Like all ectoparasites, monogeneans have well-developed attachment structures. Pass out of the snail and encyst on vegetation, which is eaten by the definitive host.

Views Read Edit View history. Freshwater fish that become infected with this parasite become lethargic and end up swimming towards the surface of the water. For instance, pond flukes infect fish in ponds.

Trematoda – Wikipedia

Botulus microporusa giant digenean parasite from the intestine of a lancetfish. Viviparous varieties release larvae, which immediately attach to another host. Trematoda Rudolphi About 25, living species have been described. Since the worm has no circulatory systemclassse elongated gut brings food to nearly all areas of the clzsse body.

The mouth is located at the forward end of the animal, and opens into a muscular, pumping pharynx. These groups are also known as Polyonchoinea and Heteronchoinea, respectively.

The smaller Aspidogastreacomprising about speciesare obligate parasites of mollusks and may also infect turtles and fishincluding cartilaginous fish. Most trematodes are monpgenea and alternately reproduce sexually and asexually. Tapeworms are the dominant member of the class Cestoidea. Although they are hermaphroditesthe male reproductive system becomes functional before the female part.

They are internal parasites of molluscs and vertebrates. Dinosaur, the common name given to a group of reptiles, often very large, that first appeared roughly….