Acilius japonicus

imago
Acilius japonicus
Acilius japonicus

These are which my friend gave me and called in Japan; mesusuji originates in the lines of wing tops which only female has. They length 14.0-17.3mm and lives north Japan. And when it comes to similar species; Acilius kishii( female doesn't have line of wing tops ) lives one and only pond in middle Japan and not anywhere. Ofcourse these are protected by low.

larva
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Acilius japonicus
pupa
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Acilius japonicus