Promissum is an extinct genus of conodonts, primitive chordates, that lived from the Ordovician to the Devonian period (about 500 million years ago). Some call it the Niagara Foundation fish. A conodont, Promissum had a primitive mouth under its eyes with mineralized teeth, which are both typical for conodonts. It had a primitive backbone and probably looked like a small eel or large worm, lacking any kind of fins except for perhaps a small one on the tail. It was relatively large for a conodont, reaching about 40 cm (16 inch) in length. The type species is Promissum pulchrum.