''Satyrium mera'' is a
butterfly of the family
Lycaenidae. It is
endemic to
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
.
The larva on feeds on ''
Rhamnus'' (Rhamnaceae). ''Satyrium mera'' is single brooded and overwinters as an egg.
Adults are found in August. Regional variants, as in the ground colour of the wing, occur. There are oval sexual marks on the surface of the forewing of males but not in females.
Description in Seitz:
"Still larger, almost equalling in size a large ''
S. pruni'' but the male above without any red in the anal area of the hindwing. The tails longer than in ''S. pruni'', the white line of the underside distinct and very straight, double in the anal area of the hindwing. — In Japan, not plentiful, probably the eastern representative of pruni, which does not occur in Japan."
[ Adalbert Seitz ''Die Großschmetterlinge der Erde'', Verlag Alfred Kernen, Stuttgart Band 1: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes,
Die palaearktischen Tagfalter, 1909, 379 Seiten, mit 89 kolorierten Tafeln (3470 Figuren)]
References
Satyrium (butterfly)
Butterflies described in 1873
Taxa named by Oliver Erichson Janson
{{Eumaeini-stub