The earliest Eocene (Ypresian) Fur Formation (Denmark) is globally renowned for its exceptionally well-preserved fossils, including birds, sea turtles, insects, plants, andfishes. Fishes, albeit abundant and diverse, however, areonly superficially known and very few detailed, taxonomic studies have been realized to date. A new polymixiiformfish,Polyspinatusflueregen. et sp. nov., from the Fur Formation ...