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Pseudocoelomates:Phylum Nematoda

Pseudocoelomates:Phylum Nematoda. Originated from south American AndesThe name Nematoda comes from the Greek word Nema meaning thread, and Eidos meaning form.Also known as RoundwormsThe Nematodes were originally named Nematoidea by Rudolphi (1808). They were renamed Nematodes by Burmeister 1837. then Nematoda (Diesing 1861). .

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Pseudocoelomates:Phylum Nematoda

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    2. Pseudocoelomates:Phylum Nematoda Originated from south American Andes The name Nematoda comes from the Greek word Nema meaning thread, and Eidos meaning form. Also known as Roundworms The Nematodes were originally named Nematoidea by Rudolphi (1808). They were renamed Nematodes by Burmeister 1837. then Nematoda (Diesing 1861).

    3. General Characteristics Nematodes are bilaterally symmetrical and vermiform. They have more than two cell layers, tissues and organs. Body cavity is a pseudocoel, body fluid under high pressure. The body of Nematodes is covered in a tough cuticle made of epidermal cells or keratinocytes. Nematodes have a nervous system with a pharyngeal ring. They do not have circulatory system. The body of a nematode has a through gut with a subterminal anus. Vermiform- long, thin, cylindrical shape of a worm. Pseudocoel-the body cavity of certain invertebrate animals between the body wall and the intestine. False body cavity. Pharyngeal-of, pertaining to, or situated near the pharynx. Subterminal -Located or occurring near an end.

    4. The bodies of nematodes can range from less than 1 mm to more than one meter. Nematodes are non segmented. Nematodes periodically shed their cuticle and forms a new, larger one. Female nematodes are larger than males. Nematodes posess triploblastic protosomes There are 25 000 known Nematodes, these include parasitic and free-living organisms. Nematodes reproduce sexually, which involves internal fertilization. Nematodes play an important role in decompostion and nutrient cycle. Triploblastic-having three primary germ layers, as the embryos of vertebrates

    5. Taxonomy Phylum Nematoda is divided into two classes, Adenophorea and Secernentea. Adenophorea: are primarily free-living nematode. They live in marine, freshwater and terrestrial environments. They are considered to be the most primitive form of nematodes.

    6. Secernentea: are almost exclusively terrestrial nematodes, they are generally parasitic of plants, invertebrate and vertebrate animals.

    8. Day to Day Processes Locomotion: They undulate, meaning they move in a wave-like manner. Thick muscle fibers contract with the absence of circular muscles.

    9. Day to Day Processes Reproduction: Nematode's reproduce sexually. Males are smaller and have a bent tail Nematode's sperm is thought to be the only eukaryotic cell without the globular protein G4.

    10. Day to Day Processes What They Eat: Bacteria Fungi Protozoans Some are filter feeders (straining suspended matter and food particles from water) Excretion: Has an anus at its posterior end and a series of excretory tubes that end in an excretory pore

    11. Day to Day Processes Digest system

    12. Works cited www.en.wikipedia.org/wiki/Nematodes www.faculty.vassar.edu/mehaffey/academic/animalstructure/outlines/nematoda www.earthlife.com www.mcwdn.org/Animals/Roundworms Campbell, Neil&Reece, Jane. Biology,Seventh Edition. San Francisco, California, United States of America, 2005. Bowers, R.&Eichorn, D.&Silverman, L.&de Souza, G&Young,R. Biology 11 Toronto, Ontario, Canada, 2001.

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