part of animal organ formation kidney rudiment formation pronephros morphogenesis pronephros formation 2010-02-22T11:16:26Z mah biological_process GO:0072116 The developmental process pertaining to the initial formation of the pronephros. In mammals, the pronephros is the first of the three embryonic kidneys to be established and exists only transiently. In lower vertebrates such as fish and amphibia, the pronephros is the fully functional embryonic kidney and is indispensable for larval life. pronephric kidney formation