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pirayaguara, sorry, I could not get a view of its back.
It is a marsh frog, they sometimes have a stripe, but sometimes not so I don't think that will help for the identification. It's definitely not a common frog because it doesn't have a dark mask over the eyes. It's too large for the other 'green' frogs so will be a marsh frog. The scientific name you have is out of date and incorrectly spelled; it should be Pelophylax ridibundus.
pirayguara, I've agreed your identification as it was correct, this should increase your reputation in amphibians and reptiles. I only added mine to ensure iSpot knows what species it is.
If you use the 'get recommended' button when making an identification, iSpot will (usually) add the most up to date name. I have to say, that even these names are sometimes a bit out of date...
Thanks again MM
Lat/Lng: 51.48706902945, 0.22669699811399
OS grid ref: TQ546788
Rainham Marshes RSPB Nature Reserve.