Does it have a short, medium or long sheathed tail?

Skerjabinema ovis.

Hello friend, the type of esophagus is rare but I think you should take pictures of the copulatory bag and other reproductive structures of the parasite.

Sebastian Muchiut ,we found only the female

Yagoob Garedaghi thanks a lot

If you have other images, send it to me to identify.

Other images are essential for the identification.

Yagoob Garedaghi You are right. It is Skerjabinema ovis and the following paper support the answer.

Skerjabinema ovis.

We also found it in bighorn sheep and domestic goats.