Euthalia merta, the dark-male baron, is a butterfly of the family Nymphalidae (Limenitidinae). It is found in the Indomalayan realm."Euthalia Hübner, " at Markku Savela's Lepidoptera and Some Other Life Forms It is a large butterfly with forewings with an angular apex and concave outer edge and hindwings with an angular anal angle. The wings are beige to brown, marbled. Subspecies E. m. merta Assam to Peninsular Malaya, Singapore E. m. apicalis (Vollenhoven, 1862) Borneo E. m. pseudomerta Fruhstorfer, 1906 Sumatra E. m. prisca Fruhstorfer, 1913 Bangka E. m. phantasma Fruhstorfer, 1913 Nias E. m. pseuderiphyle Fruhstorfer, 1913 E. m. karina Kalis, 1933 Sabang E. m. milleri Pendlebury, 1939 Langkawi Is. E. m. tioma Eliot, 1978 Pulau Tioman E. m. schoenigi Schröder & Treadaway, 1978 Philippines (Negros)
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