What kind of worm?

Has anyone ever seen a worm like this in a cat's stool? A stray that we feed from time to time (when we see her outside) passed this in our driveway.

There was mainly mucus and 4 of these, which wiggled a lot. They look nothing like roundworms or tapeworms to me. They don't seem to resemble whipworms or hookworms either.

We trapped her last year and spayed her. If I can get her again, she will go to the doc. Until then I had planned to leave the dewormer (pyrantel or fenbendazole) in

Zoomed a bit.

Any ideas?

No clue, but it looks gross.  I'd get her trapped and to the vet asap.