Promissum is an extinct genus of conodonts, primitive chordates, that lived during the Upper Ordovician period.
Promissum is an extinct genus of conodonts, primitive chordates, that lived during the Upper Ordovician period.
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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).