Euthalia merta, the dark-male baron, is a butterfly of the family Nymphalidae (Limenitidinae). It is found in the Indomalayan realm. 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 Langkawai Is. E. m. tioma Eliot, 1978 Pulau Tioman E. m. schoenigi Schröder & Treadaway, 1978 Philippines (Negros) References merta Butterflies described in 1859