Posters here insist they are flukes, though nobody can post a link to a respected publication that identifies them as such. The closest thing to a doctor reference that I have found in my Google research identifying these is from Hulda Clark , who received a lot of criticism from the medical community for her research and treatment methods.
That said, I sure got a lot of these to release when I took anthelmintics, so the CZ posters may be right.
One reason I am uncertain is that my colon hydrotherapist says that they are mucoid plaque associated with a parasitic infection.