I often find these items (marked with red arrows) while doing equine FECs. I am interested to know what they are. I am pretty certain that they aren't parasite eggs, and I find them in samples both with and without strongyle infections. Sometimes the two black parts are offset, giving the appearance of a Micky Mouse head.
To give a scale, there is also a strongyle egg (marked with a dot) in the image which is approx 90 um long.
Thank you!