Black-mantled Tamarin vs Common Lazy Toad

Leontocebus nigricollis compared with Oreolalax major

Taxonomic Classification

Rank	Black-mantled Tamarin	Common Lazy Toad
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Amphibia (Amphibians)
Order	Primates (Primates)	Anura (Frogs & Toads)
Family	Callitrichidae	Megophryidae
Genus	Leontocebus	Oreolalax
Species	Leontocebus nigricollis	Oreolalax major

Evolutionary Relationship

Black-mantled Tamarin and Common Lazy Toad share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Black-mantled Tamarin

LC — Least Concern

Common Lazy Toad

LC — Least Concern

Physical Characteristics

Attribute	Black-mantled Tamarin	Common Lazy Toad
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black-mantled Tamarin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia and Ecuador.

Common Lazy Toad

Habitat

Typically found in freshwater habitats, moist forests, and wetlands.

Black-mantled Tamarin

The Black-mantled Tamarin (Leontocebus nigricollis) is a species in the genus Leontocebus. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

Common Lazy Toad

The Common Lazy Toad (<em>Oreolalax major</em>) is an amphibian in the family Megophryidae, classified as Least Concern on the IUCN Red List. The species typically inhabits freshwater habitats, moist forests, and wetlands, favoring cool, humid environments associated with mountain streams and adjacent riparian vegetation. As a member of the family Megophryidae, it is adapted to fast-flowing, clear mountain streams where larvae typically develop among leaf litter and gravel on the stream bed. The Common Lazy Toad is generally associated with the highland and montane zones of its range, relying on intact forest cover and unpolluted water bodies for reproduction and larval development. Its Least Concern status reflects an assessment of stable population trends, though like many amphibians it may be sensitive to changes in water quality, habitat loss, and emerging infectious diseases such as chytridiomycosis. Biological traits of this species remain poorly documented in the scientific literature.