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21 Cards in this Set

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

parasites in guts of arthopods or vertebrates.
Family Oxyuridae
Enterobius vermicularis--common nematode in USA