Coimbra-Filho’s Titi vs Formosan rock macaque

Callicebus coimbrai compared with Macaca cyclopis

Key Differences

• Coimbra-Filho’s Titi is Endangered while Formosan rock macaque is Least Concern.

Taxonomic Classification

Rank	Coimbra-Filho’s Titi	Formosan rock macaque
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class same	Mammalia (哺乳類)	Mammalia (哺乳類)
Order same	Primates (サル目)	Primates (サル目)
Family	Pitheciidae	Cercopithecidae (Old World Monkeys)
Genus	Callicebus	Macaca
Species	Callicebus coimbrai	Macaca cyclopis

Evolutionary Relationship

Coimbra-Filho’s Titi and Formosan rock macaque share a common ancestor at the Order level: Primates. (サル目)

Conservation Status

Coimbra-Filho’s Titi

EN — Endangered

Formosan rock macaque

LC — Least Concern

Physical Characteristics

Attribute	Coimbra-Filho’s Titi	Formosan rock macaque
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Coimbra-Filho’s Titi

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Formosan rock macaque

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Japan and Taiwan.

Coimbra-Filho’s Titi

The Coimbra-Filho's Titi (Callicebus coimbrai), also known as Coimbra-Filho's Titi Monkey, is a small New World monkey in the family Pitheciidae, named in honour of the Brazilian primatologist Adelmar F. Coimbra-Filho. This titi monkey is endemic to the Atlantic Forest of northeastern Brazil, with its range restricted to the states of Sergipe and southern Alagoas—one of the most critically fragmented and threatened biomes on Earth. Adults are small, with reddish-brown fur on the flanks and upperparts, pale grey on the underparts, and an orange-red forehead band. Like all titi monkeys, Callicebus coimbrai is highly social, living in monogamous family groups of 2–5 individuals that engage in elaborate dawn duets and tail-twining behaviour as expressions of pair bonding. The species inhabits Atlantic Forest fragments, including lowland and highland forest patches, riverine gallery forest, and secondary growth, where it subsists on fruits, seeds, leaves, and occasional invertebrates. The Coimbra-Filho's Titi is classified as Endangered by the IUCN due to its severely fragmented range within one of the world's most deforested biomes, with less than 12% of original Atlantic Forest remaining, ongoing habitat loss from agricultural expansion, and small, isolated population sizes highly vulnerable to stochastic extinction events.