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Eligmodontia
The genus ''Eligmodontia'' consists of five or six species of South American sigmodontine mice restricted to Bolivia, Chile, and Argentina. Species of ''Eligmodontia'' occur along the eastern side of the Andes Mountains, in Patagonia, and in the Chaco thorn forest of South America. They can be found in arid and semiarid habitats and in both high and low elevation areas. These rodents are commonly known as gerbil mice or by their local name lauchas. Sometimes they are also called silky desert mice, highland desert mice or silky-footed mice. The closest living relatives are probably the chaco mice (''Andalgalomys''), the leaf-eared mice (''Graomys'', ''Paralomys'' and ''Phyllotis''), and ''Salinomys''.〔Steppan (1996a), Mares ''et al.'' (2008)〕
==Taxonomy, systematics and evolution==
The genus receives its name from the occlusal (chewing surface) pattern of the molars〔See photo in Steppan (1996b)〕 and is derived from the Ancient Greek ''eliktos'' (ἑλικτός, "winding") and ''odontas'' (ὀδόντας, "toothed").
The systematics and taxonomy of ''Eligmodontia'' have been complicated. The first specimen was acquired by Charles Darwin in 1835 at Bahía Blanca (Argentina), during his five-year journey on the HMS Beagle. It was formally described by George R. Waterhouse as ''Mus elegans'' in February 1837,〔Waterhouse (1837)〕 just weeks after the formal description of ''E. typus'' by Frédéric Cuvier, from a specimen that he had received from Buenos Aires and which was collected six months after Darwin's.〔Cuvier (1837)〕 The two taxa were later synonymized and represent the same species.〔Mares ''et al.'' (2008)〕
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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