In Melitaea didyma the disco-cellular vein is always absent from the base of the S4 (with a green border) and the marks on the submarginal area (with a red border) are usually round.
In Melitaea trivia there is always disco-cellular vein, but only in a part of the base of the S4 (with green border) and all the marks in the submarginal area (with red border) are usually triangular.
Identification is more easy after noticing another character: the color of the segments of the abdomen in males and females of these two species.
The abdomens of male and female in Melitaea trivia
The abdomens of male and female in Melitaea didyma
Identification is more easy after noticing the color and markings in submarginal area in UPF and UPH.
In Melitaea trivia the submarginal light brown yellow marks (arrow shaped) surrounded internally and externally by dark brown color.
Melitaea didyma has black marks (almost rectangular and placed slightly internally from the position of the arrow shaped markings of Melitaea trivia) surrounded by light brown color.
Listed below are photos of five Melitaea didyma and six Melitaea trivia, to better understand the differences. In all Melitaea trivia there is always disco-cellular vein, in a part of the base of S4.
Typical detail on the center white mark on the cell of UNH: the black line (inside) is smooth (with GREEN)
Typical detail on the center white mark on the cell of the UNH: the black line (inside) is not smooth (with RED).
The second revised and enlarged edition
With the collaboration of STAVROS K. STAVRIDIS
in creation of maps, diagrams and plates
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