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The status and distribution of eight species-group taxa of the Oryzomys couesi group (Rodentia: Cricetidae: Sigmodontinae) described from western Mexico are evaluated based on morphological and morphometric comparisons. Four of these are recognized as valid species within the region: Oryzomys albiventer Merriam, 1901 (including molestus Elliot, 1903), from inland plateau of the Mesa de Aná huac; O. couesi mexicanus J.A. Allen, 1897 (including bulleri J.A. Allen, 1897; lambi Burt, 1934; rufus Merriam, 1901), from Pacific coastal plain, contiguous lower mountain slopes, and interior valleys along the Ríos Tepalcatepec–Balsas; O. nelsoni Merriam, 1898, from Isla María Madre; and O. peninsulae Thomas, 1897, from the southern tip of the Baja California Peninsula. Three other taxa named from uplands in interior Mexico— aztecus Merriam, 1901; crinitus Merriam; 1901; and regillus Goldman, 1915—are provisionally retained within O. couesi, but further study of their specific stature and relationships is required. The recommended taxonomic changes within western Mexico serve to discuss directions for future revisionary research that will refine the definition and distribution of O. couesi sensu stricto in Middle America.
Article
Oryzomys gorgasi, a new species of palustrine rice rat from the ciénaga forests of northwestern Colombia, is the first member of the Oryzomys palustris group discovered in South America. It is compared with other members of the group and with the more or less superficially similar and sympatric cricetines, Oryzomys concolor, O. capito, Nectomys alfari, and the extraterritorial Oryzomys subflavus. The zoogeography of the O. palustris group is discussed.
Familia Muridae Pp 445–566 in Mamíferos del
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NOM-059-ECOL-2001 Protección ambiental-especies nativas de México de flora y fauna silvestres-categorías de riesgo y especificaciones para su inclusión, exclusión o cambio. Lista de especies en riesgo. Diario oficial de la federación. 6 Marzo
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