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I want to work my master's degree with Ephydridae in the coastal wetlands of my country, in the department of Lima, but I am a novice in this (I have always worked with aquatic larvae). For this I am collecting pupae and then waiting for them to emerge and identify them. Maybe I should contact Mathis to see if he can help me, but I'll do it when I have more specimens, I'm just starting. I have used the key you mention and I get to E. gracilis, and the truth is very similar (including the larva and pupa that I have also been able to collect, attached photo).

Thank you very much for your help