vs Pygmy three-toed sloth

Chrysosphaerella longispina compared with Bradypus pygmaeus

Key Differences

• is Not Evaluated while Pygmy three-toed sloth is Critically Endangered.

Taxonomic Classification

Rank		Pygmy three-toed sloth
Kingdom	Chromista (โครมิสตา)	Animalia (สัตว์)
Phylum	Ochrophyta (Ochrophyta)	Chordata (สัตว์มีแกนสันหลัง)
Class	Chrysophyceae (สาหร่ายสีทอง)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Ochromonadales (Ochromonadales)	Pilosa (อันดับสลอธและตัวกินมด)
Family	Paraphysomonadaceae	Bradypodidae (Three-toed Sloths)
Genus	Chrysosphaerella	Bradypus (Three-toed Sloths)
Species	Chrysosphaerella longispina	Bradypus pygmaeus

Conservation Status

NE — Not Evaluated

Pygmy three-toed sloth

CR — Critically Endangered

Physical Characteristics

Attribute		Pygmy three-toed sloth
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Pygmy three-toed sloth

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

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.