Until fairly recently known only from the modern species and some fossil remains tentatively allocated to this group , a batch of Middle Jurassic ( Lower Callovian , c. 165-164 mya ) specimens found at La Voulte-sur-Rhône demonstrated vampyromorphid cephalopods clearly were in existence for far longer than had been believed .
Until fairly recently known only from the modern species and some fossil remains tentatively allocated to this group , a batch of Middle Jurassic c.165-164 million years ago ( mya ) specimens found at La Voulte-sur-Rhône demonstrated that clearly vampyromorphid cephalopods were in existence for far longer than has been hitherto believed .