CLASSE MONOGENEA PDF

Shagar Fish diseases and parasites. They range in size from less than one millimetre to over one metre in length. Schistosoma mansoni classse causes the disease shistosomiasis which infects around million people world-wide, causing body pain, anaemia and dysentery, and kills over cclasse year. The smaller Aspidogastreacomprising about speciesare obligate parasites of mollusks and may also infect turtles and fishincluding cartilaginous fish. 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.

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In order to facilitate their parasitic life style the Monogeneans have complicated attachment organs at the posterior or tail end of their bodies, often including a mixture of suckers, clamps, hooks and spines. Those few species which are endoparasites do not normally venture deeply into their hosts tissues, but live instead in the cloaca or bladder. Monogeneans have an indirect life-cycle, meaning the always have more than one host species and th animal lives in separate hosts during different stages of its life.

Monogeneans normally have cephalopods octopus and squid , fish, amphibians, reptiles and cetaceans whales as their primary hosts and some smaller animal that the primary host eats as their intermediate host.

An interesting Monogenean is the small Gyrodactylus elegans. This 1 mm long animal lives in the gills of European Carp, it is interesting to biologists because 4 succeeding generations of the animal appear to be born out of the one ova egg.

Each adult G. This young animal contains with in it, in embryonic form, another young animal, which in turn contains another even smaller embryo which in turn contains yet another embryo. As they grow each one of these animals gives birth to the embryo within it.

However they are not in fact four generations, but four sisters who all develop from a single egg. In this way the original mother can produce four young for the cost of only one as each sister down the line takes responsibility for nuturing the next young to be born.

Another unique Monogenean is Diplozoon paradoxum which, though larger than G. Also a parasite of fish young members of this species do not become sexually mature until they meet another member of their species.

They then achieve sexual maturity and mate, however unlike most animals they stay mated for life. The two animals form a permanent union, joined near their midsections they form a most unusual animal that looks like a cross with moveable arms. A third unusual example of a Mongenean is the Frog bladder Fluke Polystoma intergerrimum. This 13 mm 0. It times its reproductive cycle to be in harmony with the frogs reproductive cycle. Thus the larval parasites live on the gills of the frogs tadpoles.

When the frog goes through its metamorphosis and leaves the water the parasite also changes. Here in a safe and still enjoyably moist environment it reaches maturity. Then it waits patiently for the frog to mature, this takes about three years. When the frog returns to the water to breed the parasite breeds as well, starting the cycle off all over again.

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CLASSE MONOGENEA PDF

Diplozoon paradoxum Freshwater fish that become infected with this parasite become lethargic and end up swimming towards the surface of the water. In addition, some may be seen rubbing the bottom or sides of their skin where the parasite is located. Infected skin where the parasite is attached may show areas of scale loss and may produce a pinkish fluid. Gills that are infected may appear swollen and pale. Heavy infections could result in erratic swimming behavior. Affected gills may become irritated and swollen. A few species infecting certain marine fish are larger, and marine forms are generally larger than those found on freshwater hosts.

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Class Monogenea

In order to facilitate their parasitic life style the Monogeneans have complicated attachment organs at the posterior or tail end of their bodies, often including a mixture of suckers, clamps, hooks and spines. Those few species which are endoparasites do not normally venture deeply into their hosts tissues, but live instead in the cloaca or bladder. Monogeneans have an indirect life-cycle, meaning the always have more than one host species and th animal lives in separate hosts during different stages of its life. Monogeneans normally have cephalopods octopus and squid , fish, amphibians, reptiles and cetaceans whales as their primary hosts and some smaller animal that the primary host eats as their intermediate host. An interesting Monogenean is the small Gyrodactylus elegans.

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