. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Sigmodontine rodents from southeastern Brazil 247. Fig. 29: Mt. Caparaó Hocicudo Oxymycterus caparaoe (holotype MN 31997 9); skull and molars; GSL, mm; molars, mm; Arrozal, Pico da Bandeira, Parque Nacional de Caparaó, Minas Gerais. O. rufus-hispidus group, and those of the medium-size O. paramensis group equate with the medium and intermediate-size O. nasutus-O. caparaoe group. Morphometries of O. paramen- sis, O. nasutus, and O. caparaoe are virtually the
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Sigmodontine rodents from southeastern Brazil 247. Fig. 29: Mt. Caparaó Hocicudo Oxymycterus caparaoe (holotype MN 31997 9); skull and molars; GSL, mm; molars, mm; Arrozal, Pico da Bandeira, Parque Nacional de Caparaó, Minas Gerais. O. rufus-hispidus group, and those of the medium-size O. paramensis group equate with the medium and intermediate-size O. nasutus-O. caparaoe group. Morphometries of O. paramen- sis, O. nasutus, and O. caparaoe are virtually the same but O. caparaoe is intermediate in coloration, O. paramensis being the paler. Most cranial differences between O. caparaoe and O. paramensis vary randomly from population to population. The consistently different traits of O. paramensis include shorter, less protrusive rostrum, the condition reflected in shorter cranial length and incisive foramina. Other distinctions include narrower mesopterygoid fossa, and more inflated frontal sinuses (fig. 30). Remarks. The obvious difference between O. caparaoe and O. nasutus is the dark brown or dominantly eumelanin outer parts of the first and the dominantly pale reddish or orange pheomelanin outer parts of the second. Expansion of the pheomelanic band of the agouti hairs in O. nasutus with corresponding decrease in width of the eumelanic band are derived conditions. Descriptions of O. nasutus have been provided by Vieira (1953), and Gyldenstolpe (1932). Range of chromatic variation in O. caparaoe is extremely narrow and the probability that the species may be dichromatic or that it intergrades with the paler O. nasutus seems Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das For
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