Cat vs

Felis catus compared with Chrysosphaerella longispina

Taxonomic Classification

Rank	Cat
Kingdom	Animalia (Animals)	Chromista (Chromista)
Phylum	Chordata (Chordates)	Ochrophyta (Ochrophyta)
Class	Mammalia (Mammals)	Chrysophyceae (Chrysophyceae)
Order	Carnivora (Carnivorans)	Ochromonadales (Ochromonadales)
Family	Felidae (Cats)	Paraphysomonadaceae
Genus	Felis (Small Cats)	Chrysosphaerella
Species	Felis catus	Chrysosphaerella longispina

Conservation Status

Cat

NE — Not Evaluated

Trend: Stable →

NE — Not Evaluated

Physical Characteristics

Attribute	Cat
Diet	Carnivore	—
Average Lifespan	15 years	—
Average Length	46 cm	—
Average Weight	4.5 kg	—

Habitat & Geographic Range

Cat

Habitat

Inhabits deserts and xeric shrublands within the Afrotropic biogeographic realm.

Range

Widely distributed across Africa (9 countries), Asia (7 countries), Europe (11 countries), North America (13 countries), Oceania and the Pacific (11 countries), and South America (6 countries).

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Cat

One of humanity's most successful domesticated companions, domestic cats are small, agile carnivores originating from the Near Eastern wildcat (Felis silvestris lybica) domesticated approximately 10,000 years ago. With over 70 recognized breeds, cats retain strong predatory instincts and have colonized virtually every terrestrial environment on Earth. They are the world's most popular pet, with an estimated 600 million kept worldwide.

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.