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  2. Cestoda - Wikipedia

    en.wikipedia.org/wiki/Cestoda

    Life cycle of the eucestode Taenia: Inset 5 shows the scolex, a disk with hooks on the end. Inset 6 shows the tapeworm's whole body, in which the scolex is the tiny, round tip in the top left corner, and a mature proglottid has just detached. [19] Life cycle of Diphyllobothrium latum relies on at least three hosts, crustaceans, fish, and humans ...

  3. Dorisiella - Wikipedia

    en.wikipedia.org/wiki/Dorisiella

    2 Life cycle. 3 Host records. ... This species infects the gastrointestinal tract of polychaete ... This name is now recognised as a junior synonym. References ...

  4. Biological life cycle - Wikipedia

    en.wikipedia.org/wiki/Biological_life_cycle

    In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...

  5. Leucochloridium variae - Wikipedia

    en.wikipedia.org/wiki/Leucochloridium_variae

    Leucochloridium variae, the brown-banded broodsac, is a species of trematode whose life cycle involves the alternate parasitic infection of certain species of snail and bird. While there is no external evidence of the worm's existence within the bird host, the infection of the snail host is visible when its eye stalks become grotesquely ...

  6. Giardia duodenalis - Wikipedia

    en.wikipedia.org/wiki/Giardia_duodenalis

    Giardia duodenalis, also known as Giardia intestinalis and Giardia lamblia, is a flagellated parasitic protozoan microorganism of the genus Giardia that colonizes the small intestine, causing a diarrheal condition known as giardiasis.

  7. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps , extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and ...

  8. Trematoda - Wikipedia

    en.wikipedia.org/wiki/Trematoda

    Trematoda is a class of flatworms known as flukes or trematodes.They are obligate internal parasites with a complex life cycle requiring at least two hosts.The intermediate host, in which asexual reproduction occurs, is usually a snail.

  9. Parasitic worm - Wikipedia

    en.wikipedia.org/wiki/Parasitic_worm

    Parasitic worms cannot reproduce entirely within their host's body; they have a life cycle that includes some stages that need to take place outside of the host. [3] Helminths are able to survive in their mammalian hosts for many years due to their ability to manipulate the host's immune response by secreting immunomodulatory products. [4]