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Exploring the World of Nematoda: Secrets of Roundworms Unveiled

Discover the taxonomy, form, function, and life cycle stages of roundworms, including Secernentea and Adenophorea classes, along with their impact as parasites in the animal kingdom.

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Exploring the World of Nematoda: Secrets of Roundworms Unveiled

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  1. Phylum Nematoda Roundworms

  2. monsters inside me roundworms

  3. Taxonomy Kingdom Animalia Phylum Nematoda Class Secernentea Class Adenophorea Filarial worms Trichinella worm Roundworms Hookworms Pinworms

  4. General Characteristics • Live in every habitable environment on Earth • Are the simplest animal with a one-way digestive tract • Pseudocoelomates: false body cavity filled with fluid under high pressure • Have bilateral symmetry • Parasites to many plants and animals • Feed on almost anything

  5. Form and Function • BodyPlan: Pseudocoelom with true tissues and muscles • Threelayers: Ectoderm = cuticle layer: thick outer covering • Mesoderm = muscle layer • Endoderm surrounds gut cavity

  6. Form and Function • Epidermis: (ectoderm) and extremely thick cuticle layer for protection • Hydrostaticskeleton: a fluid-filled, pressurized cavity surrounded by muscle

  7. Digestion • DigestiveSystem: one-way digestive tract with mouth and anus • Mouth  pharynx  intestines  rectum  anus

  8. Circulation and Respiration • Circulation: No circulatory system: Cells circulate nutrients and gases • Respiration: gases diffuse though the skin (cuticle layer) • Sensoryorgans: 2 nerve cords and a pharyngeal nerve ring

  9. Movement • Movement: move by muscle contractions and cilia on the cuticle layer

  10. Reproduction • Dioecious ,sexual reproduction and fertilization is internal • Males have a spicule to grab on to the female during mating • Fertilized eggs are stored in the female until they can be deposited in the soil • Eggs have a tough outer shell and can live for years in the soil • One female can lay up to 200,000 eggs in one day

  11. Life Cycle Stages • There are 4 intermediate stages, some may require an intermediate host

  12. Class Secernentea: Roundworms • Most common worm parasite in humans • Live in warm, tropical regions with poor sanitation • Eggs can survive unhatched in the soil for years • Contracted by eating uncooked, contaminated vegetables • roundworm parasite in toddler

  13. Class Secernentea: Hookworms • Attach to the host’s intestines and suck blood • Can lead to anemia (excessive blood loss) • Contracted through soil, are ingested or can burrow into the skin • parasite from cat scratch

  14. Pinworms • The most common parasite in the United States • Migrate to the anus at night to lay their eggs • Contracted through ingestion or anal contact

  15. Filarial Worms • Example: heart worm in dogs, can infect humans too • Enters tissues and causes elephantitis • Contracted through mosquitoes • dog heartworm • elephantiasis

  16. Class Adenophorea: Trichinella Worm • Cause the deadly disease “trichinosis” • Can affect almost any mammal • Can infect almost any tissue type • Contracted by eating undercooked meat • trichinosis • full monsters inside me

  17. Diagram • Phylum Protozoa • Giardia, Trichomona, amoebas, ciliates, plasmodium, Kinetoplastids, paramecium • Phylum Porifera • Class Calcarea • Class Demospongiae • Class Hexactinellida • Phylum Cnidaria • Class Anthozoa • Class hydrozoa • Class Scyphozoa • Class Cubozoa • Phylum Platyhelminthes • Class Turbellaria • Class Trematoda • Class Cestoda • Phylum Nematoda • Class Adenophorea • Class Secernentea

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