Callicebus pallescens, Thomas, 1907

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 : 459-460

3.

Pale Tia

Callicebus pallescens

French: Titi pale / German: \Weil3mantel-Springaffe / Spanish: Titi blanco

Other common names: Chacoan Titi Monkey, Paraguayan Gray Titi, White-coated Titi

Taxonomy. Callicebus pallescens Thomas, 1907 ,

30 miles north of Concepcion, department of Concepcion, Paraguayan Chaco. ’

C. pallescens was considered by P. Hershkovitz in 1990 to be a subspecies of C. donacophilus . In 2001, C. P. Groves listed it as a full species and a member of the donacophilus species group. Monotypic.

Distribution. SE Bolivia, N Paraguay (S to ¢.23° S, and W of the Rio Paraguay to c.61° 30° W), and SW Brazil (Pantanal in Mato Grosso do Sul State). There are very few confirmed localities, however, and the exact limits of its geographic distribution are unclear.

Descriptive notes. Head—body 31-5 cm (males) and 36 cm (females), tail 42 cm (males) and 39 cm (females); weight ¢.800 g as for other members of the donacophilus species group. Male and female Pale Titis are similar in size and coloration. Their heads and bodies are covered with long, shaggy hair, pale buff agouti in color. Tail and limbs are also pale buff agouti. Forehead, sideburns, and ear tufts are whitish to white, with a well-developed malar (cheek) stripe; hairs almost conceal facial skin.

Habitat. Humid forests, riparian forests in particular, in the Chaco scrublands; continuousxeric forests of the northern Chaco and other swampy and riparian habitats in this biome and the neighboring Pantanal wetlands in Brazil and Bolivia.

Food and Feeding. There is no information available for this species.

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. Little is known of the ecology of the Pale Titi, although a survey in Kaa-Iya del Gran Chaco National Park in Bolivia recorded densities of 13-6-30 ind/km?, typical of titi populations, and suggested home ranges of c.15-25 ha.

Status and Conservation. CITES Appendix II. Classified as Least Concern on The [UCN Red List. There are no major threats, although the Pale Titi may be hunted in some indigenous communities. It may be present in Kaa-lya del Gran Chaco, San Matias, and Otuquis national parks in Bolivia. It occurs in Rio Negro, Chovoreca, and Defensores del Chaco national parks in Paraguay, with an area of more than one million hectares.

Bibliography. Anderson (1997), Brown & Rumiz (1986), Hershkovitz (1988, 1990), Groves (2001), Norconk (2011), Salazar-Bravo et al. (2003), Stallings (1985), Tarifa (1996), Veiga, Wallace & Velilla (2008).

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. SE Bolivia, N Paraguay (S to ¢.23° S, and W of the Rio Paraguay to c.61° 30° W), and SW Brazil (Pantanal in Mato Grosso do Sul State). There are very few confirmed localities, however, and the exact limits of its geographic distribution are unclear.