American Brook Lamprey vs koala

Lethenteron appendix compared with Phascolarctos cinereus

Key Differences

• American Brook Lamprey is Least Concern while koala is Vulnerable.

Taxonomic Classification

Rank	American Brook Lamprey	koala
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Petromyzonti (Petromyzonti)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Petromyzontiformes (ปลาแลมป์เพรย์)	Diprotodontia (Marsupials)
Family	Petromyzontidae	Phascolarctidae (Koalas)
Genus	Lethenteron	Phascolarctos (Koalas)
Species	Lethenteron appendix	Phascolarctos cinereus

Evolutionary Relationship

American Brook Lamprey and koala share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

Conservation Status

American Brook Lamprey

LC — Least Concern

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	American Brook Lamprey	koala
Diet	—	Herbivore
Average Lifespan	—	15 years
Average Length	—	75 cm
Average Weight	—	10.0 kg

Habitat & Geographic Range

American Brook Lamprey

Habitat

Native to North America, inhabiting ecosystems characteristic of the region.

Range

Found in United States.

koala

Habitat

Typically found in grasslands, forests, and vegetated habitats.

Range

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

American Brook Lamprey

The American Brook Lamprey (Lethenteron appendix) is a species in the genus Lethenteron. It is currently classified as Least Concern on the IUCN Red List. Native to North America, inhabiting ecosystems characteristic of the region.

koala

Iconic marsupial of eastern and southeastern Australia, koalas weigh up to 15 kg and spend up to 22 hours daily sleeping to conserve energy from their low-calorie eucalyptus leaf diet. Highly specialized to process toxic eucalyptus compounds that would kill most other mammals, they have gut microbiomes uniquely adapted for detoxification. Listed as Endangered in 2022, with populations decimated by chlamydia disease, habitat clearing, and climate change.