Embryo, Toxascaris leonina, x130, blue background

Embryo, Toxascaris leonina, x130, blue background

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Caption: Light micrograph of an egg of the dog and cat roundworm Toxascaris leonina, containing the developing embryo. Infection with this parasite occurs by ingestion of the second larval stage, either within the egg or in the tissues of prey such as mice. The larvae develop in the wall and lumen of the small intestine feeding on cell debris and intestinal fluids. The large white adult worms copulate and the females produce thousands of smooth-walled eggs which are deposited with the host's faeces. T. leonina occurs in young animals with other roundworms such as Toxocara sp., causing diarrhoea and failure to thrive. Magnification: x130 at 35mm size

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Keywords: animal, cat roundworm, dog and cat, dog roundworm, embryo, invertebrate, invertebrates, nature, nematoda, nematode, roundworm, toxascaris leonina, wildlife, zoology

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