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Rhithrogena gratianopolitana imago (spinner). This mayfly hatches in big numbers in some the Piedmont alps river.
I have been fishing remarkable spent falls of this species with plenty of fish activity in the beginning of spring.
It is a good sized mayfly,its body greater than 1 cm.
Ventral view.
R.gratianopolitana 'face' with typical male's compound eyes.
Dorsal view.
