Cat vs

Felis catus compared with Chrysococcus bisetus

Taxonomic Classification

Rank	Cat
Kingdom	Animalia (Animals)	Chromista (Chromista)
Phylum	Chordata (Chordates)	Ochrophyta (Ochrophyta)
Class	Mammalia (Mammals)	Chrysophyceae (Chrysophyceae)
Order	Carnivora (Carnivorans)	Chromulinales (Chromulinales)
Family	Felidae (Cats)	Dinobryaceae
Genus	Felis (Small Cats)	Chrysococcus
Species	Felis catus	Chrysococcus bisetus

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 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.

Chrysococcus bisetus is a species of unicellular chrysophyte microalga in the genus Chrysococcus, class Chrysophyceae, order Chromulinales. The genus Chrysococcus is characterized by cells enclosed within a lorica — a secreted outer case or vesicle — through which flagella protrude, a structure that distinguishes it from many other chrysophytes. The epithet bisetus, meaning two-bristled, describes a diagnostic feature of the lorica, which bears two bristle-like projections used for species identification. Chrysococcus species inhabit freshwater and brackish environments, typically occurring in cool, nutrient-poor to moderately enriched lakes, ponds, and slow-flowing water bodies. C. bisetus has been recorded from Norwegian and Swedish waters, consistent with the historical focus of chrysophyte research in Scandinavian freshwater habitats, and also from Brazilian waters, suggesting a broader distribution. Chrysophytes including Chrysococcus species are important components of oligotrophic lake phytoplankton, where they contribute to primary production and serve as food for zooplankton. The golden-brown coloration of Chrysococcus arises from chlorophylls a and c together with fucoxanthin, pigments shared with other heterokonts. Unlike diatoms, chrysophytes produce chrysolaminarin as their storage carbohydrate rather than starch. C. bisetus has not been assessed under IUCN criteria and is listed as Not Evaluated. As with most freshwater microalgae, global population size and distribution are poorly characterized, limiting meaningful conservation assessment.