MORPHOLOGY

External characteristics

Male
Forewing length (mm): 38-54. Wingspan (mm): 51-80.
Forewings: Upperside black, pale bluish/greenish spots as follows: complete series of small but conspicuous submarginal spots, series of median spots from hind margin to near apex, lower spots largest and more or less confluent, filling 1/5 to 1/3 of width of wing along vein 1, narrow linear spots in cell and at end cell, basal-most one not reaching hind margin; underside similar Hindwings Crenulate, no tail; upperside black with small but conspicuous submarginal spots, large central pale greenish band from costa to just before tornus, widest at costa, varying there from 1/5 to 1/2 of length costa; underside dark brown, as upperside but with some irregular red median spots, also red spot on vein 8 between whitish central band and small triangular whitish spot more basad.

Female
Similar to male, but dark brown rather than black.

Subspecies and variation

There is much variation in size and in the width and intensity of the color of the pale areas; twelve subspecies are recognized, nine of which are found in the Malaysian area.

Similar species

Similar to G. doson and G. evemon, with which its distribution area largely overlaps. In G. eurypylus there is almost always a double submarginal spot in space 1b on the forewing upperside, while there is only one in the other species. For similarity with G. meyeri, see there.

_{source: Jan Moonen, peronal communication 2020}