I had this delicious citrus fruit today that I'm having trouble identifying. I think it might be a tangelo, but I'm not sure. It was seedless and had a tangy/sour taste. Unlike a clementine, it did not peel very easily. It came with a delivery of other assorted fruits, so I don't know its geographical origin. In terms of size, it was about as big as a lime (too small to be a regular orange).