Appearance
The length of the forewings is 38–40 mm. It is very similar to "Eurypteryx falcata", but darker. The abdomen upperside has no dark spots on tergites four, five and six. The forewing upperside has a dark triangle lacking paler spots along the costa and has no darker area around the black discal spot. The forewing underside has a large triangular patch extending from the base of the wing to the costa. The hindwing upperside has a large black median blotch and the hindwing underside has two dark transverse lines.Naming
*"Eurypteryx alleni alleni"⤷ "Eurypteryx alleni gigas" Haxaire, 2010
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