Central Australian Rock Rat vs

Zyzomys pedunculatus compared with Chrysosphaerella longispina

Key Differences

• Central Australian Rock Rat is Critically Endangered while is Not Evaluated.

Taxonomic Classification

Rank	Central Australian Rock Rat
Kingdom	Animalia (Animals)	Chromista (Chromista)
Phylum	Chordata (Chordates)	Ochrophyta (Ochrophyta)
Class	Mammalia (Mammals)	Chrysophyceae (Chrysophyceae)
Order	Rodentia (Rodents)	Ochromonadales (Ochromonadales)
Family	Muridae (Mice & Rats)	Paraphysomonadaceae
Genus	Zyzomys	Chrysosphaerella
Species	Zyzomys pedunculatus	Chrysosphaerella longispina

Conservation Status

Central Australian Rock Rat

CR — Critically Endangered

NE — Not Evaluated

Physical Characteristics

Attribute	Central Australian Rock Rat
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Central Australian Rock Rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Central Australian Rock Rat

The Central Australian Rock Rat (Zyzomys pedunculatus) is a species in the genus Zyzomys. It is currently classified as Critically Endangered on the IUCN Red List.

Chrysosphaerella longispina is a colonial chrysophyte alga in the genus Chrysosphaerella, notable for the long silica spines (longispina: Latin, long spine) that project from each cell in the colony. The genus is characterized by spherical or discoid colonies of photosynthetic cells that each secrete siliceous scales and elongated spine-like appendages, making Chrysosphaerella colonies distinctively bristled and visible under light microscopy. The long spines of C. longispina likely serve as anti-predation structures that make the colonies more difficult for zooplankton to ingest. C. longispina is found in cold, oligotrophic freshwater lakes, particularly in Scandinavia, where comprehensive chrysophyte surveys have documented its presence. Chrysosphaerella colonies contribute to freshwater primary production and the cycling of biogenic silica, which upon cell dissolution is deposited in lake sediments as microscopically identifiable remains. These silica structures are widely used by paleolimnologists to reconstruct past changes in lake water chemistry, thermal stratification, and climate. The conservation status of C. longispina has not been assessed by the IUCN; the species is listed as Not Evaluated.