¿Es posible reconocer una unidad biótica entre América del Norte y del Sur?
Is it possible to recognize a biotic unit between North and South America?
César A. Ríos-Muñoz
Museo de Zoología “Alfonso L. Herrera”, Facultad de Ciencias, Universidad Nacional Autónoma de México. Apartado postal 70-399, 04510 México, D. F., México
Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México. Av. Universidad 3000, Coyoacán, 04510 México, D. F., México
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