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  2. Nematode - Wikipedia

    en.wikipedia.org/wiki/Nematode

    Unlike the flatworms, nematodes have a tubular digestive system, with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. [3]

  3. Trichinella - Wikipedia

    en.wikipedia.org/wiki/Trichinella

    Trichinella is the genus of parasitic roundworms of the phylum Nematoda that cause trichinosis (also known as trichinellosis). Members of this genus are often called trichinella or trichina worms. A characteristic of Nematoda is the one-way digestive tract, with a pseudocoelom (body cavity made up of only an ectoderm and endoderm).

  4. Extracellular digestion - Wikipedia

    en.wikipedia.org/wiki/Extracellular_digestion

    The most primitive digestive tract is seen in nematodes (phylum Nematode), where it is simply a tubular gut lined by an epithelial membrane. Earthworms (phylum Annelids) have a digestive tract specialized in different regions for the ingestion, storage, fragmentation, digestion and absorption of food.

  5. Stylet (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Stylet_(anatomy)

    For example, the word stylet or stomatostyle is used for the primitive piercing mouthparts of some nematodes [1] and some nemerteans. In these groups the stylet is a hardened protrusible opening to the stomach. These stylets are adapted for the piercing of cell walls and usually function by providing the operative organism with access to the ...

  6. Intestinal parasite infection - Wikipedia

    en.wikipedia.org/wiki/Intestinal_parasite_infection

    An intestinal parasite infection is a condition in which a parasite infects the gastro-intestinal tract of humans and other animals. Such parasites can live anywhere in the body, but most prefer the intestinal wall.

  7. Ascaris - Wikipedia

    en.wikipedia.org/wiki/Ascaris

    Ascaris is a nematode genus of parasitic worms known as the "small intestinal roundworms". [1] One species, Ascaris lumbricoides , affects humans and causes the disease ascariasis . Another species, Ascaris suum , typically infects pigs .

  8. Heligmosomoides polygyrus - Wikipedia

    en.wikipedia.org/wiki/Heligmosomoides_polygyrus

    Heligmosomoides polygyrus is a naturally occurring intestinal roundworm of rodents. [1] It belongs to the family Trychostrongylidae, and male and female worms are morphologically distinguishable. [2]

  9. Hookworm - Wikipedia

    en.wikipedia.org/wiki/Hookworm

    Once the larvae have entered the host they travel in the circulatory system to the lungs where they leave the venules and enter the alveoli. They then travel up the trachea and are coughed up, swallowed and end up in the small intestine. In the small intestine, the larvae moult into stage four (L4) the adult worm.