Coimbra-Filho’s Titi vs Fernandina Nesoryzomys

Callicebus coimbrai compared with Nesoryzomys fernandinae

Key Differences

• Coimbra-Filho’s Titi is Endangered while Fernandina Nesoryzomys is Vulnerable.

Taxonomic Classification

Rank	Coimbra-Filho’s Titi	Fernandina Nesoryzomys
Kingdom same	Animalia (động vật)	Animalia (động vật)
Phylum same	Chordata (động vật có dây sống)	Chordata (động vật có dây sống)
Class same	Mammalia (lớp Thú)	Mammalia (lớp Thú)
Order	Primates (bộ Linh trưởng)	Rodentia (Bộ Gặm nhấm)
Family	Pitheciidae	Cricetidae
Genus	Callicebus	Nesoryzomys
Species	Callicebus coimbrai	Nesoryzomys fernandinae

Evolutionary Relationship

Coimbra-Filho’s Titi and Fernandina Nesoryzomys share a common ancestor at the Class level: Mammalia. (lớp Thú)

Conservation Status

Coimbra-Filho’s Titi

EN — Endangered

Fernandina Nesoryzomys

VU — Vulnerable

Physical Characteristics

Attribute	Coimbra-Filho’s Titi	Fernandina Nesoryzomys
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Coimbra-Filho’s Titi

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Fernandina Nesoryzomys

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

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.