2011nematodes2 - 11/20/2011 Classification PhylumNematoda...

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11/20/2011 1 Classification Phylum Nematoda Class Adenophorea Order Trichocephalida Genera: Trichuris,/ Trichinella Class Secernentea Subclass Rhabditida Order Rhabditia (suborder Rhabditina) Genus: Strongyloides Order Strongylida Genera: Ancylostoma,Necator Order Ascaridida Genera: Ascaris,Toxocara, Anisakis / Enterobius Order Spirurida Genera: Wuchereria,Brugia, Onchoerca, Loa, Dirofilaria / Dracunculus Strongyloides stercoralis( The threadworm ) Class Secernentea Order Rhabditia Phasmids Are didelphic (two uteri and oviducts) Protandrogonous females: male reproductive organs develop first and then disappear; then female reproductive organs develop. Parthenogenesis : development of an unfertilized egg into an adult.
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11/20/2011 2 Morphology Parasitic females are longer and have an esophagus that extends one third the length of the body. Vulva at posterior end. The free living female is wider. Vulva is at mid section. Prepatent period 25- 30days
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11/20/2011 3 Epidemiology Strongyloides eggs are seldom seen in feces. Dogs and cats are infected with strains indistinguishable from those that infect humans. A proportion of human infections may be zoonosis. Worldwide distribution, over 100 200 million cases world wide. High incidence in mental institutions. Adults are more often infected that children. Strongyloides fuelleborni
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2011nematodes2 - 11/20/2011 Classification PhylumNematoda...

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