Thesis

PARASITISM IN THE ANIMAL KINGDOM A quick travel along of the puppet kingdom shows that there atomic number 18 leechlike members in very much every issue phylum. Among the Protozoa, many species of amoebae, flagellates, ciliates, and all of the Sporozoa be parasitic. It is of interest to occupation that despite their small sizes, certain protozoa, much(prenominal) as Stentor and Spirostomum can suffice 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, include forms that be super acid poriferans in cephalopods and another(prenominal) marine invertebrates. Dicyema, for example, is a common parasite in the nephridia of squids and octopuses. Rhopalura is a slight common mesozoan parasite encountered in various tissues and carcass cavities of marine turbellarians, nemerteans, brittle star, oligochaetes and clams. Although parasitic coe lenterates are not common, virtually are known. One of the virtually democratic subdivisions of Parasitology is parasitic wormology, which deals specifically with the parasitic representatives of the Platyhelminthes, the Nematoda and the Acanthocephala. All Platyhelminthes, except the turbellarians, are parasitic and even a few cases of parasitism have been report among turbellarians.

numerous species of nematodes are parasitic, many as parasites of animal and others as parasites of plants. The phylum Acanthocephala are all parasitic. In addition to these major groups of helminthes, the less commonly encoun tered Nematomorpha, or horsehair worm, are o! f interest to helminthologists, because the larvae of most species are parasitic in insects although the adults are free-living in aquatic situations. Some species of the phylum Mollusca, in addition to serving as univocal or as intermediate hosts for protozoan and helminth parasite, may also be ectoparasitic continuously or during some stagecoach of their life cycle. Among the Annelida, the leeches are common ectoparasites on various...If you need to attempt a full essay, order it on our website: OrderCustomPaper.com

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