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Haeckel Leptomedusae. top left Aequorea discus Haeckel Eschscholtz Haeckel Haeckel Haeckel Haeckel Forskl Haeckel Haeckel Orchistoma sp side view Kunstformen der Natur plate Leptomedusae see mpizkoeln mpg de html here mpizkoeln mpg de html here and mpizkoeln mpg de html here creator Ernst Haeckel public domain