Toxocara canis

Intestinal Roundworm of Dogs


Rev 09/23/2022

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Morphology and Anatomy Life Cycle
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Class:    Chromadorea
SubClass: Spiruria
Order:   Ascaridida
Superfamily: Ascaridoidea
Family:  Ascarididae

  •         Toxocara canis

  • Morphology and Anatomy:

    Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:


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    Neotropical : Few common in North America, many abound in tropical countries.

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    Economic Importance:

    May cause death in canines and larval visceral migrans in humans.

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    Common among wild and domestic animals.

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    Eats the fluid in the intestine of humans and/or animals that are infected with the eggs.

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    Life Cycle:

    After the male injects sperm into the reproductive tract the shelled embryos or zygotes are stored in the uterus until deposition. The eggs hatch in the small intestine and the larvae enter the hepatic venules, migrating to the lungs.

    For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters


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    Hickman, Cleveland P. and Roberts, Larry S. ANIMAL DIVERSITY. Wm. C. Brown Publishers, 1994 pp. 130-132.
    Olsen, Wilford O. ANIMAL PARASITES. Burgess Publishing Company, 1962. pp. 276-286

    Material from Petra A. Garcia, 1995.

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