Glueckmanotodus heinzelini was an extinct shark whose pointed teeth carried smaller sharp points beside the main crown. Such teeth suggest a mouth capable of gripping food, although they cannot tell us what the shark ate. No complete body is known from the material reviewed here, so its adult size and overall appearance remain uncertain.

Like living sharks, Glueckmanotodus would have replaced teeth throughout its life. A tooth lost by a living animal could settle into sediment without the shark’s skeleton accompanying it. Over millions of years, these small, durable remains became a record of an otherwise elusive animal.

In Britain, teeth are recorded from the late Palaeocene Beltinge Fish Bed at Herne Bay in Kent. LBPS also records the species from the younger, early Eocene Lessness Shell Bed at Abbey Wood in south-east London. These are different fossil deposits of different ages, each preserving evidence of ancient life in a distinctive geological setting.

When the species was first described from Belgian fossils in 1967, scientists had only ten isolated teeth to work with. Later researchers recognised that some Herne Bay teeth once assigned to a different shark belonged to Glueckmanotodus. A few small finds, carefully compared, had restored an animal to the fossil record across more than one place and time.