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Gracilinanus
''Gracilinanus'' is a genus of opossum in the family Didelphidae. It was separated from the genus ''Marmosa'' in 1989, and has since had the genera ''Cryptonanus'', ''Chacodelphys'', and ''Hyladelphys'' removed from it. It contains the following species:〔
*Aceramarca gracile opossum (''Gracilinanus aceramarcae'')
*Agile gracile opossum (''Gracilinanus agilis'')
*Wood sprite gracile opossum (''Gracilinanus dryas'')
*Emilia's gracile opossum (''Gracilinanus emilae'')
*Northern gracile opossum (''Gracilinanus marica'')
*Brazilian gracile opossum (''Gracilinanus microtarsus'')
== Physical Description ==
Gracile mouse opossums, excluding the fat-tailed mouse opossum, in general, have a prehensile tail that is thin and really long. The tails of mouse opossums are naked.〔"Mouse opossum". Encyclopedia Britannica. Encyclopedia Britannica Online Academic Edition. Encyclopedia Britannica Inc., 2012. Web 3 November 2012. 〕 Mouse opossums have ears that are, both, large and naked.〔 General opossums, including ''Gracilinanus'' species, have noses that are pointed. Another general characteristic that mouse opossum have are mammary glands.〔 Each member of the ''Gracilinanus'' species has a dark ring that is found around each eye.〔〔"Mammals." EDGE of Existence. Web. 28 November 2012. .〕 The species ''G. microtarsus'' has red-brown fur on the top of the body and gray fur on the underside.〔Pires, Mathias M., Eduardo G. Martins, Maria Nazareth F. Silva, and Sérgio F. Dos Reis. "''Gracilinanus Microtarsus'' (Didelphimorphia: Didelphidae)." Mammalian Species 42 (2010).〕 In comparison with ''G. microtarsus'', ''G. agilis'' has paler fur color.〔 Over the years, a new species, ''G. ignitus'', has been added to the genus. ''G. ignitus'' has a white patch on its chest. It, as well, has a light, two-tone colored tail that has only a few hairs. The fur color can be used to determine if a member of the genus is part of the ''G. ignitus'' species. ''G. microtarsus'', ''G. emiliae'', and ''G. dryas'' can be distinguished from ''G. ignitus'' by their tails that are only one color. One difference between ''G. agilis'' and ''G. ignitus'' is that ''G. agilis'' has a hairier tail. ''G. aceramarcae'' has naked skin compared to ''G. ignitus''. ''G. emiliae'' is smaller than ''G. ignitus''.〔Díaz, M. Mónica, David A. Flores, and Rubén M. Barquez. "A New Species Of Gracile Mouse Opossum, Genus ''Gracilinanus'' (Didelphimorphia: Didelphidae), From Argentina." Journal of Mammalogy 83.3 (2002).〕 ''G. emiliae'', in general, has a very long tail. A difference between ''G. emiliae'' and the rest of the species in the genus is that it has white fur on the underside of the body and the rest of the species have a gray or brown color.〔Voss, R. S., D. W. Fleck, and S. A. Jansa. "On the Diagnostic Characters, Ecogeographic Distribution, and Phylogenetic Relationships of ''Gracilinanus Emiliae'' (Didelphimorphia: Didelphidae: Thylamyini)." Mastozoologia Neotropical 16.2 (2009): 434,36. 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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