You are correct that this is an early stage or unfertilzed egg. It is still too round in shape, though to be a mouse pinworm. I think it is a reptile pinworm egg, I'm just not sure of the species. Mouse pinworms are really elongate and curved. Snake pinworm eggs become more like a stretched oval with one side flattened a little. If you look closely, however at the picture of the worm that you showed, you will see the esophogeal bulb that is typical of mouse pinworms. It wouldn't surprise me at all to see both in a snake. Of course, the mouse pinworms do not need to be treated because they are not pathogenic in snakes (and you'll never get rid of them anyway..every time the snake eats a mouse with pinworms you'll see them). The reptile pinworm may be problematic if there are enough of them. Panacur should definitely clear that up. I would do another exam after about 3 weeks. If it shows completely negative, do another one after another 2 or 3 weeks. Sometimes they will fool you and you'll think they are gone, but they just aren't shedding eggs when you did the exam.

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