Geographic locations of Marmosa murina individuals and its X chromosome morphology data in South America. Literature data represented by empty circles and present work represented by full circles: (● 18) Villa Vivêncio, Colômbia, Hayman and Martin 1974; (● 20) Loreto-Peru, Reig et al. 1977; (● 19) Bolívar, Venezuela, Reig et al. 1977; (○ 3) Negro River; (○ 2) Juruá River; (○ 4) Purus River; (○ 8) Uatumã River; (○ 10) Trombetas River; (○ 12) Jari River; (● 16) Pernambuco State, Souza et al. 1990; (● 21) Tartarugalzinho, Amapá State State, Carvalho et al. 2002; (● 22) Vila Rica Mato Grosso State, Pagnozzi et al. 2002; (● 23) UHE Peixe Angical,TO, Pereira et al. 2008; (● 24) Tocantins State, Lima 2004; (● 25) Uruaçú, Goiás State , Carvalho et al. 2002; (● 26) Colinas do Sul, Goiás state; (● 27) UHE Corumbá IV Luziania, Goiás state Pereira et al. 2008; (● 28) Pacoti, Ceará State, Pagnozzi et al. 2002; (● 29) Espírito Santo State, Paresque et al. 2004. m = metacentric; sm = submetacentric; a = acrocentric.