Common cattle grub vs Polynesian rat

Hypoderma lineatum compared with Rattus exulans

Key Differences

• Common cattle grub is Extinct while Polynesian rat is Least Concern.

Taxonomic Classification

Rank	Common cattle grub	Polynesian rat
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Chordata (Chordates)
Class	Insecta (Insects)	Mammalia (Mammals)
Order	Diptera (Diptera)	Rodentia (Rodents)
Family	Oestridae	Muridae (Mice & Rats)
Genus	Hypoderma	Rattus
Species	Hypoderma lineatum	Rattus exulans

Evolutionary Relationship

Common cattle grub and Polynesian rat share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Common cattle grub

EX — Extinct

Polynesian rat

LC — Least Concern

Physical Characteristics

Attribute	Common cattle grub	Polynesian rat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common cattle grub

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Japan, Norway, Sweden, and United States.

Polynesian rat

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical coniferous forests, among 4 distinct biome types spanning the Australasia and Indomalayan realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (6 countries), Europe (United Kingdom), North America (United States), Oceania and the Pacific (11 countries), and South America (Chile).

Common cattle grub

<em>Hypoderma lineatum</em>, commonly known as the common cattle grub, is a parasitic fly species with documented occurrences in Japan, Norway, Sweden, and the United States. It typically inhabited terrestrial and freshwater environments, often associated with cattle and other large ungulates on which its larvae develop as subcutaneous parasites. The species is classified as Extinct on the IUCN Red List, indicating that it is no longer known to exist in the wild. Common cattle grub belongs to the genus <em>Hypoderma</em> within the family Oestridae. Adult flies do not feed and are short-lived, while larvae burrow under the skin of host animals, causing a condition known as hypodermosis or warble fly infestation. The decline and extinction of this species has been linked to widespread and highly effective veterinary treatment programs targeting warble fly larvae in cattle, which drastically reduced host populations and ultimately eliminated the species. Biological traits such as average lifespan, body length, and mass of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 2 countries:

🇯🇵 Japan 🇺🇸 United States