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- Pelophylax is a taxon understood either as a separate genus of True frogs (Ranidae), or as a subgenus (or synonym) of the genus Rana.
- Pelophylax esculentus does not represent a "real" biological species but a hybridogenetic klepton (therefore also written "Pelophylax kl. esculentus / Rana kl. esculenta") as a result of hybridization between the parental taxa Pelophylax lessonae (Rana lessonae) and Pelophylax ridibundus (Rana ridibunda)
- Contrary to most hybrids, these ones are able to exist and reproduce themselves without the syntope presence and the participation of specimen from the parental taxa. (But in case they are present, hybridization regularly takes place.)
- In Central Europe, Pelophylax esculentus is by far the most common and abundant form of waterfrogs.