In veterinary parasitology, which organism is known to have an adult form that is a fly and a larval stage that is an endoparasite?

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Study for the VTNE Laboratory Procedures Test. Use flashcards and multiple choice questions, each question offers hints and explanations, enabling increased understanding and retention. Prepare effectively for your exam!

Multiple Choice

In veterinary parasitology, which organism is known to have an adult form that is a fly and a larval stage that is an endoparasite?

Explanation:
This item is about life cycles where the adult form is a fly and the larval stage parasitizes inside the host. Gasterophilus, the stomach botfly, fits this pattern. The adults are flies that lay eggs on the hair of horses. When the horse grooming or licks its mouth, the eggs hatch and the larvae are ingested. The larvae then migrate to the stomach and attach to the gastric mucosa, where they spend months as internal endoparasites. Eventually they are excreted with feces to pupate and later emerge as adult flies. This combination—adult fly stage and internal larval parasitism—identifies Gasterophilus as the correct organism. The other organisms listed do not have this life-cycle arrangement: their adults are not flies, and their larval stages do not function as internal gastrointestinal parasites in the same way.

This item is about life cycles where the adult form is a fly and the larval stage parasitizes inside the host. Gasterophilus, the stomach botfly, fits this pattern. The adults are flies that lay eggs on the hair of horses. When the horse grooming or licks its mouth, the eggs hatch and the larvae are ingested. The larvae then migrate to the stomach and attach to the gastric mucosa, where they spend months as internal endoparasites. Eventually they are excreted with feces to pupate and later emerge as adult flies. This combination—adult fly stage and internal larval parasitism—identifies Gasterophilus as the correct organism. The other organisms listed do not have this life-cycle arrangement: their adults are not flies, and their larval stages do not function as internal gastrointestinal parasites in the same way.

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