Far Eastern Brook Lamprey vs Gray-bellied Night Monkey

Lethenteron reissneri compared with Aotus lemurinus

Key Differences

• Far Eastern Brook Lamprey is Least Concern while Gray-bellied Night Monkey is Vulnerable.

Taxonomic Classification

Rank	Far Eastern Brook Lamprey	Gray-bellied Night Monkey
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Petromyzonti (Petromyzonti)	Mammalia (Mammals)
Order	Petromyzontiformes (lamprey)	Primates (Primates)
Family	Petromyzontidae	Aotidae
Genus	Lethenteron	Aotus
Species	Lethenteron reissneri	Aotus lemurinus

Evolutionary Relationship

Far Eastern Brook Lamprey and Gray-bellied Night Monkey share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Far Eastern Brook Lamprey

LC — Least Concern

Gray-bellied Night Monkey

VU — Vulnerable

Physical Characteristics

Attribute	Far Eastern Brook Lamprey	Gray-bellied Night Monkey
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Far Eastern Brook Lamprey

Gray-bellied Night Monkey

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia, Ecuador, and Venezuela. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.