Nesoryzomys swarthi Orr 1938

• Main Authors: Don E. Wilson, Russell A. Mittermeier, Thomas E. Lacher, Jr
• Format: Other/Unknown Material
• Language: unknown
• Published: Lynx Edicions 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Mammalia; Rodentia; Cricetidae; Nesoryzomys; Nesoryzomys swarthi; Rattus rattus
• Online Access: https://doi.org/10.5281/zenodo.6727342; http://treatment.plazi.org/id/03F06D13FF0120C80DB2185A0E1DF7EF

493. Santiago Galapagos Mouse Nesoryzomys swarthi French: Oryzomys de Santiago / German: Santiago-Galapagosratte / Spanish: Raton de Galapagos de Santiago Other common names: Santiago Nesoryzomys, Swarth's Nesoryzomys Taxonomy. Nesoryzomys swarthi Orr, 1938, Sullivan Bay, Santiago Island, Galapagos Islands, Ecuador. This species is monotypic. Distribution. Restricted to Santiago I, Galapagos Is. Descriptive notes. Head-body 110-190 mm, tail 100-163 mm, ear 19-25 mm, hindfoot 29-40 mm; weight 31-181 g (mean male 106 g, mean female 82 g). Living species of Nesoryzomys —an endemic genus of Galapagos Islands—are small (c.30 g) to moderately large (c.100 g) oryzomyine rats, with medium-sized ears and well-haired tails shorter than headbody length. Fur is medium in length and color varies from medium brown or dark brown to black; belly is paler. White subauricular patch is usually present. There are four pairs of mammae. The Santiago Galapagos Mouse is the largest species of Nesoryzomys. Males are slightly larger and heavier than females. Pelage is relatively long and dense. Dorsum is brownish brown, with bicolored or tricolored hairs, always with gray bases. Venter is paler than dorsum. Tail is bicolored, covered with hairs, denser at base and with loosely visible scales; apical tuft is barely present. Base oftail is covered with dense fur similar in color to the back. Legs are whitish. Habitat. Arid and shrub areas, specifically mature cactus thornscrub dominated by Opuntia galapageia (Cactaceae), Bursera graveolens (Burseraceae), and Croton scouler: (Euphorbiaceae). Food and Feeding. Spool-and-line to track visitation to plants and dietary trials showed that the Santiago Galapagos Mouse ate fruits and plant matter, with narrow dietary breadth in wet season that broadened in dry season. Female Santiago Galapagos Mice had more diverse diets than males. Although dietary overlap was high between native and invasive rodents (e.g. Roof Rat, Rattus rattus) that tended to select fruits yearround, the Santiago Galapagos ...