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It's in the tank of my friend. He does not absolutely the correct name of the species. The Pigmentation recalls a C. paleatus but the dorsal fin seems to me far too long. It has 3 and in all 3 the dorsal fin is so long.
Corydoras longipinnis has much longer dorsals, over twice as long
However, to complicate matters, highfin C paleatus is described too, and some C paleatus have longer dorsals than others. I have 2 groupes of C paleatus, collected myself in Uruguay, I would guess some 150 km (or 100 miles) apart. One has males with much higher dorsals than the other. Therefore some variation is to be expected