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Phyla Nematoda

Phyla Nematoda. By: Alex Palasz , Alex Roszczyk , Danielle Perri , Vicky Moskal. Germ Layers. 3 germ layers: endoderm, mesoderm, and ectoderm. Nematodes are considered triploblasts because they have three germ layers. . Symmetry. Bilateral symmetry. Coelom.

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Phyla Nematoda

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  1. Phyla Nematoda By: Alex Palasz, Alex Roszczyk, Danielle Perri, Vicky Moskal

  2. Germ Layers • 3 germ layers: endoderm, mesoderm, and ectoderm. • Nematodes are considered triploblasts because they have three germ layers.

  3. Symmetry • Bilateral symmetry

  4. Coelom • Nematodes have a pseudocoelom because they have a body cavitiy that is lined with mesoderm and endoderm as opposed to just mesoderm.

  5. Digestive Tract • Tube-like digestive tract with a mouth and an anus.

  6. Cephalization • Centralization of nerves in the head region. • Nematodes have a rear nerve ring around the area of the pharynx.

  7. Segmentation • Non-segmented.

  8. Skeleton & appendages • The hydro-skeleton maintains high water pressure in the nematode to keep its structure. • They have a tough elastic outer-cuticle that is used for movement. • The flexibility of the muscles combined with the hydro-skeleton allows the nematode to swim in a “whip-like” movement.

  9. Circulatory system • None • The outer-cuticle of the nematode allows nutrients and necessary materials to flow into the nematode and through its body through diffusion.

  10. Respiratory system • None • The outer cuticle is permeable to water and gasses so it is used to breathe and absorb necessary nutrients.

  11. reproduction • Nematodes reproduce sexually. • They reproduce through internal fertilization. In most species of nematodes, organisms are separated by sexes and the females tend to be larger.

  12. Male vs. Female Bodies

  13. habitat • Nematodes usually inhabit water, soil, and bodies of other plants or animals. • As many as 1 million nematodes inhabit one square yard of soil.

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