Humpback smooth hound vs Lesser Short-tailed Rat

Mustelus whitneyi compared with Brachyuromys betsileoensis

Key Differences

• Humpback smooth hound is Critically Endangered while Lesser Short-tailed Rat is Least Concern.

Taxonomic Classification

Rank	Humpback smooth hound	Lesser Short-tailed Rat
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Chondrichthyes (Cartilaginous Fish)	Mammalia (Mammals)
Order	Carcharhiniformes (Ground Sharks)	Rodentia (Rodents)
Family	Triakidae	Nesomyidae
Genus	Mustelus	Brachyuromys
Species	Mustelus whitneyi	Brachyuromys betsileoensis

Evolutionary Relationship

Humpback smooth hound and Lesser Short-tailed Rat share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Humpback smooth hound

CR — Critically Endangered

Lesser Short-tailed Rat

LC — Least Concern

Physical Characteristics

Attribute	Humpback smooth hound	Lesser Short-tailed Rat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Humpback smooth hound

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate grasslands and steppes, and montane grasslands and shrublands, among 5 distinct biome types within the Neotropic biogeographic realm.

Range

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

Lesser Short-tailed Rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.