Aotus griseimembra Elliot 1912
Creators: name: Russell A. Mittermeier
name: Anthony B. Rylands
name: Don E. Wilson
Publisher: name: Lynx Edicions
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Primates
Aotidae
Aotus
Aotus griseimembra

description: 2. Gray-legged Night Monkey Aotus griseimembra
French: Douroucouli a bras gris / German: Elliot-Nachtaffe / Spanish: Mico nocturno de patas grises Other common names: Gray-handed Night Monkey, Yellow-bellied Night Monkey, Yellow-bellied Owl Monkey
Taxonomy. Aotus griseimembra Elliot, 1912,
Hacienda Cincinnati, Santa Marta, and Rio Sinu Cereté, Bolivar, Colombia.
This species is monotypic.
Distribution. N Colombia and NW Venezuela, where it occurs in the Rio Magdalena Valley and N lowlands in Colombia, including the Sierra Nevada de Santa Marta and basins of the rios Sinu and San Jorge, extending into Venezuela in the vicinity of Lake Maracaibo and the Sierra de Perija.
Descriptive notes. Head-body ¢.48 cm, tail c.42 cm; weight 800-1000 g. The Graylegged Night Monkey is one of the gray-necked species, with a diploid chromosome number of 52-54. Hair on the side of the neck is grayish-agouti to brownish-agouti. Upperparts of the body are grayish to buffy, with at a poorly- defined brownish medial dorsal band. The chest, belly, and inner surfaces of the legs (as far as the knees and elbows) are brownish or yellowish to pale orange. Pelage is relatively short and adpressed. Facial pattern is inconspicuous, and dorsal parts of the hands and feet are light coftee-brown, with darker hair tips. There is no interscapular whorl or crest.
Habitat. Primary and secondary tropical lowland forest. The Gray-legged Night Monkey has also been observed in coffee plantations.
Food and Feeding. There is no information available for this species.
Breeding. Mean interbirth intervals of c¢.13 months and a gestation of 133 days have been reported for the Gray-legged Night Monkey in captivity.
Activity patterns. There is no specific information available for this species, but it is no doubt nocturnal and arboreal.
Movements, Home range and Social organization. Group size is 2-4 individuals, typically with an adult pair and their offspring. A density of 150 ind/km® has been reported in a census conducted in northern Colombia, but this unusually high density may be explained by the fact that data were collected in a forest remnant that may have served as a refuge.
Status and Conservation. CITES Appendix II. Classified as Vulnerable on The IUCN Red List. The Magdalena Valley has been settled and farmed for centuries. Deforestation is widespread, and Gray-legged Night Monkeys are restricted to small and isolated forest fragments. Due to this and its use in biomedical research, it is considered the most threatened of Colombian night monkeys. The Gray-legged Night Monkey occurs in the national natural parks of Catatumbo-Bari, Isla de Salamanca, Sierra Nevada de Santa Marta, and Tayrona, and the fauna and flora sanctuaries of Ciénaga Grande de Santa Marta and Iguaque.
Bibliography. Brumback (1975a), Defler (2003b, 2004), Defler & Bueno (2007), Dixson & Fleming (1981), Dixson et al. (1980), Erkert & Grober (1986), Fernandez-Duque (2011a, 2012), Green (1978), Handley (1976), Hunter et al. (1979), Kumamoto & Houck (2001), Rauth-Widmann et al. (1996), Umana et al. (1984), Uribe (1989), Wright (1981, 1989, 1994), Yunis et al. (1977).
description: Published as part of Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson, 2013, Aotidae, pp. 414-431 in Handbook of the Mammals of the World – Volume 3 Primates, Barcelona :Lynx Edicions on page 427, DOI: 10.5281/zenodo.5726960