Coimbra-Filho’s Titi vs Desmarest’s Spiny Pocket Mouse

Callicebus coimbrai compared with Heteromys desmarestianus

Key Differences

• Coimbra-Filho’s Titi is Endangered while Desmarest’s Spiny Pocket Mouse is Least Concern.

Taxonomic Classification

Rank	Coimbra-Filho’s Titi	Desmarest’s Spiny Pocket Mouse
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class same	Mammalia (哺乳動物)	Mammalia (哺乳動物)
Order	Primates (灵长目)	Rodentia (啮齿目)
Family	Pitheciidae	Heteromyidae
Genus	Callicebus	Heteromys
Species	Callicebus coimbrai	Heteromys desmarestianus

Evolutionary Relationship

Coimbra-Filho’s Titi and Desmarest’s Spiny Pocket Mouse share a common ancestor at the Class level: Mammalia. (哺乳動物)

Conservation Status

Coimbra-Filho’s Titi

EN — Endangered

Desmarest’s Spiny Pocket Mouse

LC — Least Concern

Physical Characteristics

Attribute	Coimbra-Filho’s Titi	Desmarest’s Spiny Pocket Mouse
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Coimbra-Filho’s Titi

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Desmarest’s Spiny Pocket Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Colombia.

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.