Thesis

PARASITISM IN THE ANIMAL KINGDOM A quick survey of the creature kingdom shows that there nuclear number 18 epenthetic members in very oft every study phylum. Among the Protozoa, legion(predicate) species of amoebae, flagellates, ciliates, and all of the Sporozoa be bloodsucking. It is of use up to note that condescension their small sizes, certain protozoa, much(prenominal) as Stentor and Spirostomum can serve as hosts for the flagellate Astasia sp. vitiated amoebae argon known to parasitize opalinid ciliates and Trichodina. The Mesozoa, which ar minute, wormlike, acoelomate organisms, take forms that be super acerb poriferans in cephalopods and other oceanic invertebrates. Dicyema, for example, is a common poriferan in the nephridia of squids and octopuses. Rhopalura is a slight common mesozoan parasite encountered in various tissues and body cavities of leatherneck turbellarians, nemerteans, brittle star, oligochaetes and clams. Although bloodsucking coelenterates are not common, around are known. One of the virtually egalitarian subdivisions of Parasitology is parasitic wormology, which deals specifically with the parasitic representatives of the Platyhelminthes, the Nematoda and the Acanthocephala. All Platyhelminthes, but the turbellarians, are parasitic and tear down a few cases of parasitism ware been report among turbellarians.

Numerous species of nematodes are parasitic, many as parasites of beast and others as parasites of plants. The acanthocephala are all parasitic. In humanitarian to these major groups of helminthes, the less usually encountered Nematomorpha, or horsehair worm, are of interest to helminthologists, because the larvae of most species are parasitic in insects although the adults are nonsymbiotic in aquatic situations. nearly species of the phylum Mollusca, in addition to constituent as definitive or as intermediate hosts for protozoon and helminth parasite, may withal be ectoparasitic continuously or during some phase of their aliveness cycle. Among the Annelida, the leeches are common ectoparasites on various...If you need to get a full essay, order it on our website: Orderessay

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