Callicebus olallae, Lonnberg, 1939

Russell A. Mittermeier, Anthony B. Rylands & Don E. Wilson, 2013, Phitheciidae, Handbook of the Mammals of the World – Volume 3 Primates, Barcelona: Lynx Edicions, pp. 432-483 : 460

4.

Olallas’ Tin

Callicebus olallae

French: Titi d'Olalla / German: Olalla-Springaffe / Spanish: Titi de los Olalla

Other common names: Beni Titi Monkey, Olalla Brothers’ Titi, Olallas’ Titi Monkey

Taxonomy. Callicebus olallae Lönnberg, 1939 ,

La Laguna (5 km from Santa Rosa), Rio Beni, Bolivia.

C. olallae is a member of the donacophilus species group. There may be some overlap with the distribution of C. modestus , although the two species appear to occur in distinct habitats. Monotypic.

Distribution. N Bolivia (SW Beni Department); distribution is poorly known, but it appears to be restricted to gallery forests and adjacent fragments of forest on the rios Yacuma and Manique.

Descriptive notes. Head—body 32-5 cm (males), tail 42-5 cm (males); weight ¢.800 g as for other members of the donacophilus species group. Body is uniformly orange. Tail is entirely dark agouti, contrasting with an orange back. Outer surfaces of limbs are reddish brown. Sideburns, beard, and forehead are blackish, forming a facial fringe; crown is reddish brown agouti. Ear tufts are weakly developed and whitish.

Habitat. Predominantly patches of gallery forest in a forest-savanna mosaic at elevations of up to 400 m. Olallas’ Titis are known to cross gaps between forest fragments of more than 300-400 m on the ground.

Food and Feeding. There is no specific information available for this species, but the diet of Olallas’ Titi is probably similar to that of othertitis, being highly frugivorous, with some consumption of leaves, flowers, and arthropods.

Breeding. There is no specific information available for this species, but all titis form monogamous breeding pairs. The male provides parental care by carrying the single offspring.

Activity patterns. There is no information available for this species.

Movements, Home range and Social organization. Census estimates of Olallas’ Titis showed densities of up to 11-5 groups/km?*, which suggest a home range size of c.10 ha. Much lower densities (as low as 1-8 groups/km?) have been recorded at other sites. Groups of only two individuals are the norm at mostsites, with a mean group size of 2-7 being recorded at onesite.

Status and Conservation. CITES Appendix II. Classified as Endangered on The IUCN Red List. Olallas’ Titi is threatened primarily by deforestation in its extremely small geographic distribution (400 km?). It is also hunted for pets or killed for use as bait. It is not found in any officially protected areas.

Bibliography. Anderson (1997), Brown & Rumiz (1986), Felton et al. (2006), Hershkovitz (1988, 1990), Lopez-Strauss (2008), Martinez & Wallace (2007, 2010, 2011), Mercado & Wallace (2010), Norconk (2011), Rowe & Martinez (2003), Salazar-Bravo et al. (2003), Tarifa (1996), Veiga, Wallace & Martinez (2008b).

Figures

On following pages: 4. Olallas’ Titi (Callicebus olallae); 5. San Martin Titi (Callicebus oenanthe); 6. Coppery Titi (Callicebus cupreus); 7. Red-crowned Titi (Callicebus discolon; 8. Ornate Titi (Callicebus ornatus); 9. Chestnut-bellied Titi (Callicebus caligatus); 10. Doubtful Titi (Callicebus dubius); 11. Stephen Nash's Titi (Callicebus stephennashi); 12. Caqueta Titi (Callicebus caquetensis);, 13. Ashy Titi (Callicebus cinerascens); 14. Hoffmanns's Titi (Callicebus hoffmannsi); 15. Lake Baptista Titi (Callicebus baptista); 16. Red-bellied Titi (Callicebus moloch).

Distribution. N Bolivia (SW Beni Department); distribution is poorly known, but it appears to be restricted to gallery forests and adjacent fragments of forest on the rios Yacuma and Manique.