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21 Cards in this Set
- Front
- Back
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What are the three parts of the Nematode esophugus?
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1) Corpus-function as a pharyx- has muscles
2) isthmus- non-muscular connections 3) bulb- function as a stomach to macerate food. |
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What is eutely?
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growth by cell enlargement
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What are the two classes under Phylum Nematoda
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1) Rhabditea
2) Enoplea |
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What is Rhabditiform esophogus?
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all 3 ancestral parts revealed.
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What is filariform esophagus?
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corpus undeveloped.
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In what stage of Family Strongyloididae, is the juvenile infective?
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3rd stage.
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Order Strongylida
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mouth without lips, and bulb reduced. - Strongyliform esophagus.
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Hookworms
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Family Anclyosmatidae
feed on blood. 3rd stage- infective |
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What are 2 species of hookworms?
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Necator Americanus and Anclyostoma duodenale
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Haemonchus contortus
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serious veterinary pest. in Family Trichostrongylidae. causes anemia. live in 4th stomach of ruminants.
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Angiostrongylus cantonensis
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zoonotic disease in humans. hosts are rats. feed on pulmonary artery. 3rd stage migrate to brain and then lungs.
-in humans cause serious encephalitic disease. |
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Order Ascaridida
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male- no bursa and simple spicules.
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Ascaris Lumbricoides
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block intestines or block pancreatic duct.
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Toxocara cati
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Family Toxocaridae
in cats. similar to Ascaris but prenatal infection common. |
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Visceral larva migrans
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serious damage if worm enters brain.
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Family Anisakidae
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hosts marine animals
requires 2 intermediate hosts. |
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Anisakis species
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problem in humans. "sushi worm". worms cant complete development but destroy lining of stomach, intestines- ulcers, perotinitis. surgical removal necessary
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Family Heterakidae
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large worms in cecums of birds
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Heterakis gallinarum
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pheasants and domestic poultry. may use earthworms as paratenic hosts.
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Order Oxyurida
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small worms with elongate, sharply pointed tails (pinworms). bulb-very well developed.
parasites in guts of arthopods or vertebrates. |
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Family Oxyuridae
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Enterobius vermicularis--common nematode in USA
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