vs Polar bear

Cocconeis neothumensis compared with Ursus maritimus

Key Differences

is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank		Polar bear
Kingdom	Chromista (色藻界)	Animalia (动物界)
Phylum	Ochrophyta (淡色藻门)	Chordata (脊索动物门)
Class	Bacillariophyceae (硅藻纲)	Mammalia (哺乳動物)
Order	Achnanthales (曲壳藻目)	Carnivora (食肉目)
Family	Cocconeidaceae	Ursidae (Bears)
Genus	Cocconeis	Ursus (Bears)
Species	Cocconeis neothumensis	Ursus maritimus

Conservation Status

NE — Not Evaluated

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute		Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Habitat

Native to Europe and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Brazil, Norway, and Sweden.

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Cocconeis neothumensis is an epiphytic diatom in the family Cocconeidaceae, closely related to the type species Cocconeis thumensis but representing a morphologically and molecularly distinct taxon distinguished by the specific architecture of its silica frustule valves. The genus Cocconeis comprises adnate diatoms that attach firmly to solid substrates in aquatic environments, including the surfaces of submerged macrophytes, periphyton mats, and sediment particles in rivers, lakes, and coastal habitats. Cocconeis neothumensis has been recorded from freshwater bodies in South America and other regions, contributing to the benthic periphyton communities that coat submerged surfaces in well-lit aquatic habitats. The frustule ornamentation—including the density and arrangement of transapical striae and the morphology of the raphe system—provides the key morphological characters used to distinguish this species from its congeners under light and electron microscopy. Like all diatoms, C. neothumensis requires dissolved silicic acid to construct its frustule and depends on phosphorus and nitrogen availability for growth, making it a sensitive indicator of nutrient conditions in monitored water bodies. Periphytic diatom communities including Cocconeis species are widely used in ecological assessment frameworks such as the European Water Framework Directive to evaluate the biological quality of freshwater bodies based on assemblage composition. Conservation status is not formally evaluated.