A single Gotha Ursinus G.I was adapted as a seaplane, designated the Gotha WD.4 or Gotha UWD.
(UWD stands for Ursinus Wasser Doppeldecker -- Ursinus Water Biplane.)
It completed several bombing missions until it was damaged in July 1916. No further examples were built.
[2]
Peter Gray and Owen Thetford. German Aircraft of the First World War. Great Britain, Putnam, 1962, 1987. ISBN0-85177-809-7.
Jack Herris, Gotha Aircraft of WWI. USA, Aeronaut Books, 2013. ISBN978-1-935881-14-8
Heinz J. Nowarra, Bruce Robertson, and Peter G. Cooksley. Marine Aircraft of the 1914-1918 War. Letchworth, Herts, England: Harleyford Publications Limited, 1966. ISBN0900435070