Nematodes 1

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    Toxocara canis; characterized by a thick, rough, pitted shell.
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    Toxocara cati; same rough, thick, pitted shell but slightly smaller than Toxocara canis
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    Toxascaris leonina; has a lighter appearance in the embryo and a smooth outer shell with a roughened inner layer; ascarid of dog and cat
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    Ascarid Roundworm (Arrowhead)
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    Division of the zygote of a Toxocara egg. Left: Cell; Right: Morula
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    Larvae of Toxocara can live within the egg for many months
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    vermi-form embryo, larvae developing within the eggs of Toxascaris leonina
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    Toxocara canis egg that has ruptured spilling out its contents
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    • Left: Toxascaris leonina;
    • Right: Toxocara canis; egg is brownish in color with a pitted shell
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    Massive Ascariasis in a young dog, this will often lead to intussusceptions
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    Eggs of Toxocara cati the ascarid of cats and rarely of dogs. Also note two oocysts of Isospora felis.
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    An egg of Toxocara cati and an oocyst of Isospora felis.
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    Eggs of Toxocara cati (right) and Ancylostoma tubaeformae. (left)
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    Eggs of Parascaris equorum, the ascarid of horses. Notice the brown to yellow color and a thick, rough shell.
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    Parascaris equorum, these eggs may be found lacking the external shell covering making them appear colorless.
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    Elliptical perforation and a mass of Parascaris equorum. Rupture of the small intestines.
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    Eggs of Ascaris lumbricoides the ascarid of humans.
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    Eggs of Ascaris lumbricoides or Ascaris suum, the ascarid of swine.
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    Ancylostoma sp. Notice the smooth, thin outer shell which contains several cells that will quickly divide to form a morula (embryo)
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    Eggs of Uncinaria stenocephala very similar to Ancylostoma caninum but larger.
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    Ancylostoma tubaeformae occurs in cats, no real distinction from Ancylostoma caninum
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    Eggs of Ancylostoma caninum more common and more pathogenic
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    Eggs of Uncinaria stenocephala (Larger eggs) and Ancylostoma caninum (smaller eggs), also in the upper right hand corner Toxocara canis, one of the ascarids. Uncinaria sp. 65-80 microns. Ancylostoma sp. 55-65 microns
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    Eggs of Uncinaria stenocephala (larger eggs) and Ancylostoma caninum (smaller eggs)
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    Hookworm anemia- pale mucus membranes, weakness, and death. Puppies may succumb to the infection before the eggs are detectable in the feces.
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    Hookworm infection in a puppy, bloody feces characterized by dark tarry, chocolate brown stools.
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    Eggs of Toxocara canis and Toxascaris leonina, both species can be found in dogs, foxes, and coyotes. The small eggs are Ancylostoma caninum.
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    Toxocara cati and Ancylostoma tubaeformae found in cat feces.
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    Eggs of Ancylostoma caninum observed in various stages of segmentation.
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    First stage larvae of hookworms can hatch in about 48 hours.
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    Larvae of hookworms may become desiccated by the flotation solution.
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    Trichuris sp. (whip-like) the thicker end is the posterior end. They can be several centimeters long.
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    Trichuris vulpis, the whip worm of dogs. Notice the egg is brown in color, barrel shaped, has bipolar plugs, and a smooth outer shell.
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    Trichuris campanula, infrequent parasite of cats
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    End on end orientation of the Trichuris sp. (at arrow), this can disguise the characteristics.
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    Trichuris vulpis and Alaria canis, the stomach fluke.
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    Trichuris vulpis and Ancylostoma caninum
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    Trichuris vulpis on the mucosa of the colon
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    Eggs of Trichuris vulpis, the whipworm of dogs and wild canids.
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    Eggs of Trichuris vulpis not to be confused with lungworms which have a rough outer shell.
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    Eucoleus aerophila similar to Trichuris sp. But has a stubbier shape and is pale in color
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    Eggs of Trichuris suis, the whipworm of swine. X100
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    Egg of Trichuris suis X400
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    Aelurostrongylus sp. Note the kinked tail which is characteristic of lungworms.
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    Egg and larvae of Dictyocaulus arnfeldi, the lungworm of horses. These were taken from bronchial exudate. Only the larvae are found in the feces.
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    Eggs, part of a larvae, and an empty shell of Dictyocaulus arnfeldi. X400
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    Eggs of Dictyocaulus filaria, the lungworm of sheep, goats, and deer. They are embryonated when laid but usually hatch before they leave the host in the feces.
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    Eggs of Strongyloides papillosus the intestinal thread worm of cattle, sheep and swine. X400
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    Metastrongylus apri, one of the lungworms of swine recovered from bronchial exudate. X100
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    Rhabditiform larva of Strongyloides stercoralis, the intestinal "threadworm" of dogs, foxes, cats and man. The eggs hatch in the intestinal mucosa.
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    Strongyloides larva normally appear in fresh feces of infected dogs, the eggs are usually not seen.
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    Strongyloides stercoralis X400

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Author:
Hfowler51
ID:
275404
Filename:
Nematodes 1
Updated:
2014-05-26 19:54:34
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