Phylum Nematoda
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  • 1. Presented by: Group 3 (Fantastic Amoeba)
  • 2. Phylum Nematoda (Greek: thread) Defining Characteristics:  Paired amphids ( anterior chemosensory organs)  Vermiform with circular cross section(roundworms)  No Circulatory System  Excretory system: renette  Linear Digestive System  Syncytial  Undergo ensheathment  Undergo chromosome diminution
  • 3. Trichuris trichiura Defining Charactristics:  “ Whip worm”  Most common gastrointestinal parasites of human  Lack lips  Have stichosome esophagus  Eggs possess plugs  Male have coiled posterior end Pathogenesis: Trichuriasis  Rectal prolapse  IH: none
  • 4. Trichuris trichiura Taxonomic Key: Phylum: Nematoda Class: Aphamida Order: Trichurida Family: Trichuridae Genus:Trichuris Species: Trichuris trichiura
  • 5. Trichuris trichiura Female Mouth Stichosome
  • 6. Trichuris trichiura Male Mouth Stichosome Testes Copulatory spicule
  • 7. Trichinella spiralis Defining Characteristics:  “ Trichina Worms”  One of the smallest nematode  Have calcified cystic wall  Pathogenesis: Trichinosis IH and DH: the same Diagnosis:  Xenodiagnosis
  • 8. Trichinella spiralis Taxonomic Key: Phylum: Nematoda Class: Aphasmida Order: Trichurida Family: Trichinellidae Genus: Trichinella Species: Trichinella spiralis
  • 9. Trichinella spiralis Encysted Larva
  • 10. Capillaria Defining Characteristics:  Gradual caudal and cephalic transition  Eggs have two plugs with pits Pathogenesis: Capillariasis IH: fish  Capillaria philippinensis
  • 11. Capillaria Taxonomic Key: Phylum: Nematoda Class: Aphasmida Order: Trichurida Family: Capillariidae Genus: Capillaria Species: Capillaria
  • 12. Capillaria plugs  pits
  • 13. Ascaris lumbricoides Defining Characteristics:  “Intestinal Roundworm”  Chromosome diminution  Have three lips  Coelomocytes (cells found in pseudocoel) Pathogenesis:  Ascariasis  Pneumonitis  Transplacental migration
  • 14. Ascaris lumbricoides Taxonomis Key: Phylum: Nematoda Class: Phasmida Order: Ascaridida Family: Ascaridoidea Genus: Ascaris Species: Ascaris lumbricoides
  • 15. Ascaris lumbricoides Female c.s. Cuticle Hypodermis Muscular layer Ovaries Intestine Uterus Pseudocoel
  • 16. Ascaris lumbricoides Male c.s. Cuticle Hypodermis Muscular layer Testes Intestine Pseudocoel
  • 17. Ascaris suum (Pig Ascaris) Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Ascaridida Family: Ascaridoidea Genus: Ascaris Species: Ascaris suum
  • 18. Enterobius vermicularis Defining Characteritics: “Pinworms”  Cuticle is transparent  Have 3 small lips  Male is minute  Family affair Pathogenesis:  Itchiness and retrofection
  • 19. Enterobius vermicularis Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Oxyurata Family: Oxyuroidea Genus: Enterobius Species: Enterobius vermicularis
  • 20. Wuchereria bancrofti Defining Characteristics:  Invade lymphatic system and may cause abstruction of lymph passages. Pathogenesis Elephantiasis or filariasis IH: Anopheles mosquito
  • 21. Wuchereria bancrofti Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Ascaridida Family: Filarioidea Genus: Wuchereria Species: Wuchereria bancr
  • 22. Wuchereria bancrofti
  • 23. Ancylostoma caninum Defining Characteristics:  “Hookworm”  Dentin in buccal capsule  Male has copulatory bursa Pathogenesis Creeping eruption Filariform: infective larva Rhabditiform: juvenile stage
  • 24. Ancylostoma caninum Taxonomic Key: Phylum: Nematoda Class: Phasmida Order: Stongylida Family: Ancylostomatidae Genus: Ancylostoma Species: Ancylostoma caninum
  • 25. Ancylostoma caninum Rhabditiform
  • 26. Ancylostoma caninum Filariform
  • 27. Ancylostoma caninum Female Dentin/ teeth Buccal capsule Ovaries
  • 28. Ancylostoma caninum Male Dentin/ teeth Buccal capsule Copulatory bursa
  • 29.  How do you differentiate morphologically the adult forms and eggs of T. trichiura and Capillaria?  What is the characteristic of E. vermicularis eggs making it easily transmissible?  How do you differentiate morphologically the adult forms of Ascaris suum from A. lumbricoides  Differentiate: rhabditiform, filariform and microfilaria
  • 30.  Describe and give the function: a. phasmids b. amphids c. renette d. meromyarial muscles e. polymyarial muscles  Describe the molting pattern of Nematodes. Which stage is usually infective to the host?  Why do eggs of Ascaris suum do not readily infect humans and vice versa?