here's a quick drawing. the suc*** at the tip of the body was clear. the organs inside the body were black or dark and visible through the body. rather than being flat, the body was rounded sort of like a funnel or a cake decorating bag. the tail had a vein in the middle extending its entire length. to each side of this vein the rest of tail extended outward like a fin. like the shape of an eel.
i'm not sure on the length of the tail in relation to the body. for each one we've passed, the tail has varied in length or is in two part. its obviously a weak part of the worm.
we've travelled in india and south america so this could be from one of those regions.