Birch Marble vs

Apotomis betuletana compared with Chrysosphaerella longispina

Key Differences

Birch Marble is Least Concern while is Not Evaluated.

Taxonomic Classification

Rank	Birch Marble
Kingdom	Animalia (Tier)	Chromista (Chromista)
Phylum	Arthropoda (Gliederfüßer)	Ochrophyta (Ochrophyta)
Class	Insecta (Insekten)	Chrysophyceae (Goldbraune Algen)
Order	Lepidoptera (Schmetterlinge)	Ochromonadales (Goldmonaden)
Family	Tortricidae	Paraphysomonadaceae
Genus	Apotomis	Chrysosphaerella
Species	Apotomis betuletana	Chrysosphaerella longispina

Conservation Status

Birch Marble

LC — Least Concern

NE — Not Evaluated

Physical Characteristics

Attribute	Birch Marble
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Birch Marble

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Birch Marble

The Birch Marble (Apotomis betuletana) is a species in the genus Apotomis. It is currently classified as Least Concern on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

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.