The Rhamphorhynchus (Rhamphorhynchus muensteri) is a pterosaur in the Rhamphorhynchidae family of long-tailed pterosaurs in the Jurassic period. Rhamphorhynchus means beak snout. It is a cousin of the dinosaurs, and it is believed to be among the first flying vertebrates.

It had a long tail that ended with a soft tail vane. It had needle-like teeth that were angled forward. It also had a curved, sharp, beak-like tip that lacked teeth. From a study of its teeth and stomach contents, palaeontologists think that its diet was mainly fish and cuttlefish.