A New Species of Thomasomys (Rodentia: Muridae) from Eastern Ecuador, with Remarks on Mammalian Diversity and Biogeography in the Cordillera Oriental Author VOSS, ROBERT S. text American Museum Novitates 2003 2003-12-09 3421 1 48 http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29421%3C0001%3AANSOTR%3E2.0.CO%3B2 journal article 10.1206/0003-0082(2003)421<0001:ANSOTR>2.0.CO;2 f4c2f80e-4917-4b5b-9415-0ee6377973ce 0003-0082 4734917 Microryzomys minutus (Tomes) SPECIMENS COLLECTED: 6.2 km (by road) W Papallacta (UMMZ 155678); Río Papallacta valley [ 3–5 km by trail NNW Papallacta], 11,100 ft (UMMZ 155679, 155801); 1.4 km (by road) E Papallacta (UMMZ 155797); 1.6 km (by road) E Papallacta, 10,250 ft (AMNH 248278; UMMZ 127126). OTHER MATERIAL: A single specimen (AMNH 46804) collected by L. Söderström in 1914 is labeled ‘‘Papallacta 11,000 ft’’. TAXONOMY: Carleton and Musser (1989) reviewed the morphological characters and taxonomy of this species, based in part on the material listed above. FIELD OBSERVATIONS : The six specimens of Microryzomys minutus that I collected near Papallacta in 1978 and 1980 were trapped at elevations ranging from 3040 to 3570 m . Of these, three were taken in dense secondary growth surrounded by pastures (below 3200 m ), and three were in Subalpine Rain Forest (above 3300 m ). Five specimens were trapped on the ground (two on the banks of small streams, two under tangles of mossy debris, one inside a hollow trunk), but one was trapped on the mossy limb of a small tree.