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''Oecomys sydandersoni'' is an arboreal species of rodent in the genus ''Oecomys''. It lives in forest patches in a small area in eastern Bolivia. It is a medium-sized species, weighing about 45 g (1.6 oz), with mostly grayish and brownish fur and short and broad hindfeet with well-developed pads. First collected in 1964, it was formally described in 2009. The species may be most closely related to ''O. concolor'' and ''O. mamorae'', which are distributed further north and south in South America. Among other characters, the three share a particular arrangement of the arteries of the head. Virtually nothing is known of its biology. == Taxonomy == An American Museum of Natural History expedition led by Sydney Anderson collected the first three specimens of ''Oecomys sydandersoni'' in 1964 and 1965.〔Carleton et al., 2009, p. 19〕 The material was mentioned in passing in a report on the chiggers of the region〔Brennan, 1970, p. 811〕 and tentatively identified as ''O. concolor'' in publications of the 1990s.〔Carleton et al., 2009, p. 19; Anderson, 1997, p. 390〕 During studies in the Noel Kempff Mercado National Park (NKMNP) from 1997 to 2006, Smithsonian zoologist Louise Emmons and coworkers obtained large series of ''Oecomys'', including four species—''Oecomys bicolor'', ''Oecomys roberti'', ''Oecomys trinitatis'', and a fourth species they could not identify to species level.〔Emmons et al., 2006, p. 38〕 In 2009, Michael Carleton, Louise Emmons, and Guy Musser described the latter as a new species, ''Oecomys sydandersoni'', referring to it the specimens collected in the 1960s and previously identified as ''O. concolor''.〔Carleton et al., 2009, p. 8〕 They named the new species after Sydney Anderson in honor of his work on the Bolivian mammal fauna, including the first collection of ''O. sydandersoni''.〔Carleton et al., 2009, pp. 19, 21〕 Its closest relatives may be ''O. concolor'' from northern Amazonia, including northwestern Brazil, southern Venezuela, and eastern Colombia, and ''O. mamorae'' from Bolivia, Paraguay, nearby Brazil, and possibly northeastern Argentina.〔Carleton et al., 2009, pp. 1, 26, fig.6〕 The three share a particular configuration of the arteries in the head known as the derived carotid arterial circulatory pattern, which is unique within the genus ''Oecomys'',〔Carleton et al., 2009, p. 2〕 and a general similarity in other traits.〔 However, ''O. sydandersoni'' differs from the other two in characters of the fur and in metric characters.〔Carleton et al., 2009, p. 7〕 Whether the three species are truly closely related needs to be determined using molecular data.〔 All three are part of the genus ''Oecomys'', which includes about fifteen species distributed in rainforest habitats in South America and into southern Central America.〔 ''Oecomys'' is one of the genera of the tribe Oryzomyini ("rice rats"), a diverse assemblage of American rodents of over a hundred species,〔Weksler, 2006, p. 3〕 and on higher taxonomic levels is classified in the subfamily Sigmodontinae of family Cricetidae, along with hundreds of other species of mainly small rodents.〔Musser and Carleton, 2005〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oecomys sydandersoni」の詳細全文を読む スポンサード リンク
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