Blake'S Aster vs Common Water Rat

Oclemena blakei compared with Hydromys chrysogaster

Key Differences

• Blake'S Aster is Extinct while Common Water Rat is Least Concern.

Taxonomic Classification

Rank	Blake'S Aster	Common Water Rat
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (Chordates)
Class	Magnoliopsida (Dicots)	Mammalia (Mammals)
Order	Asterales (Daisies & Sunflowers)	Rodentia (Rodents)
Family	Asteraceae (Daisy Family)	Muridae (Mice & Rats)
Genus	Oclemena	Hydromys
Species	Oclemena blakei	Hydromys chrysogaster

Conservation Status

Blake'S Aster

EX — Extinct

Common Water Rat

LC — Least Concern

Physical Characteristics

Attribute	Blake'S Aster	Common Water Rat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Blake'S Aster

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Canada and United States.

Common Water Rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Blake'S Aster

The Blake'S Aster (Oclemena blakei) is a species in the genus Oclemena. It is currently classified as Extinct on the IUCN Red List. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Common Water Rat

<em>Hydromys chrysogaster</em>, commonly known as the common water rat or rakali, is a semi-aquatic rodent in the family Muridae, native to Australia and New Guinea. It is classified as Least Concern by the IUCN, reflecting its relatively stable population across a broad range of freshwater and estuarine habitats on the Australian continent and associated islands. The species typically inhabits the banks of rivers, lakes, wetlands, and estuaries, where it constructs burrows in streambanks. It is highly adapted for an aquatic lifestyle, with partially webbed hind feet, a flattened head, and a dense waterproof coat. <em>Hydromys chrysogaster</em> is a carnivore, typically feeding on fish, crustaceans, mussels, frogs, and aquatic invertebrates, which it often carries to elevated feeding platforms to consume. The species is nocturnal and crepuscular, most active during early morning and evening hours near the water's edge. Biological traits including average lifespan, body length, and weight remain poorly documented in standardized databases, though adults are generally robust for a rodent, reportedly reaching body lengths of 20–35 cm excluding the tail. Geographic range details for this particular record remain incompletely documented in available data sources. Ecologically, the common water rat is an important apex predator in small-scale freshwater food webs and serves as an indicator species for wetland health in Australian riparian systems.