Photo right: Graf's frog in France.
Graf’s frog has one set of chromosomes from Rana ridibunda (Marsh frog) and one set of chromosomes from Rana perezi (Perez's frog). Graf’s frogs will couple with each other and with Perez’s frogs. Only the coupling with Perez’s frogs produces a Graf’s frog. Prior to meiosis the Graf’s frog often eliminates one set of Perez’s frog genes and conserves one set of Marsh frogs genes. It is considered that the origin of this klepton goes back to a hybridisation between the Edible frog, (Rana.kl.esculenta), and Perez’s frog, (Rana perezi), and not between the Marsh frog, (Rana ridibunda), and Perez’s frog, (Rana perezi).
Rana.kl.esculenta produces gamates from the ridibunda genome.
Caution. The above information may be out of date due to advanced genetic studies.
Protection. Berne convention. Annexe 3. National protection. Amphibians and Reptiles Article 3.
Pelophylax kl. grafi was Rana kl. grafi
Grenouille de Graf