Hi, I'm wondering if you ever got these ID'd? I've been passing them for years and am looking for what they are and what works to kill them. They are not rope worm. Not a typical fluke. Not a typical round worm or tapeworm. They have a flattened membrane-like head with a sucker mouth, long body with tail and visible eggs in the end. The longest one I've gotten out was 36 inches. No expert in the states I've contacted so far has been able to identify them, they say they look like an "alien."