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Group 3 (Fantastic Amoeba)
PHYLUM NEMATODA
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
Trichuris trichiura Defining Charactristics:
“ Whip worm” Most common gastrointestinal parasites of
human Lack lips Have stichosome esophagus Eggs possess plugs Male have coiled posterior endPathogenesis:
TrichuriasisRectal prolapse IH: none
Trichuris trichiura Taxonomic Key:
Phylum: Nematoda
Class: Aphamida
Order: Trichurida
Family: Trichuridae
Genus:Trichuris
Species: Trichuris
trichiura
Trichuris trichiura Female
MouthStichosome
Trichuris trichiura MaleMouthStichosomeTestesCopulatory spicule
Trichinella spiralis
Defining Characteristics:
“ Trichina Worms” One of the smallest nematode Have calcified cystic wall Pathogenesis:
TrichinosisIH and DH: the sameDiagnosis: Xenodiagnosis
Trichinella spiralis
Taxonomic Key:
Phylum: Nematoda
Class: Aphasmida
Order: Trichurida
Family: Trichinellidae
Genus: Trichinella
Species: Trichinella spiralis
Trichinella spiralis Encysted Larva
Capillaria
Defining Characteristics:
Gradual caudal and cephalic transition Eggs have two plugs with pitsPathogenesis:
CapillariasisIH: fishCapillaria philippinensis
Capillaria
Taxonomic Key:
Phylum: Nematoda
Class: Aphasmida
Order: Trichurida
Family: Capillariidae
Genus: Capillaria
Species: Capillaria
Capillaria
plugs pits
Ascaris lumbricoides
Defining Characteristics:
“Intestinal Roundworm” Chromosome diminution Have three lips Coelomocytes (cells found in pseudocoel)Pathogenesis: Ascariasis Pneumonitis Transplacental migration
Ascaris lumbricoides
Taxonomis Key:
Phylum: Nematoda
Class: Phasmida
Order: Ascaridida
Family: Ascaridoidea
Genus: Ascaris
Species: Ascaris
lumbricoides
Ascaris lumbricoides Female c.s.
CuticleHypodermisMuscular layerOvaries IntestineUterusPseudocoel
Ascaris lumbricoides
Male c.s.
CuticleHypodermisMuscular layerTestesIntestinePseudocoel
Ascaris suum (Pig Ascaris)
Taxonomic Key:
Phylum: Nematoda
Class: Phasmida
Order: Ascaridida
Family: Ascaridoidea
Genus: Ascaris
Species: Ascaris suum
Enterobius vermicularis
Defining Characteritics:
“Pinworms” Cuticle is transparent Have 3 small lips Male is minute Family affairPathogenesis: Itchiness and retrofection
Enterobius vermicularis
Taxonomic Key:
Phylum: Nematoda
Class: Phasmida
Order: Oxyurata
Family: Oxyuroidea
Genus: Enterobius
Species: Enterobius
vermicularis
Wuchereria bancrofti
Defining Characteristics:
Invade lymphatic system and may cause abstruction of lymph passages.
Pathogenesis Elephantiasis or filariasis
IH: Anopheles mosquito
Wuchereria bancrofti
Taxonomic Key:
Phylum: Nematoda
Class: Phasmida
Order: Ascaridida
Family: Filarioidea
Genus: Wuchereria
Species: Wuchereria
bancrofti
Wuchereria bancrofti
Ancylostoma caninum
Defining Characteristics:
“Hookworm” Dentin in buccal capsule Male has copulatory bursaPathogenesis
Creeping eruptionFilariform: infective larvaRhabditiform: juvenile stage
Ancylostoma caninum
Taxonomic Key:
Phylum: Nematoda
Class: Phasmida
Order: Stongylida
Family: Ancylostomatidae
Genus: Ancylostoma
Species:
Ancylostoma caninum
Ancylostoma caninum Rhabditiform
Ancylostoma caninum Filariform
Ancylostoma caninum FemaleDentin/ teethBuccal capsuleOvaries
Ancylostoma caninum Male
Dentin/ teethBuccal capsuleCopulatory bursa
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
Describe and give the function:a. phasmidsb. amphidsc. renetted. meromyarial musclese. 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?