Chilean Dolphin vs

Cephalorhynchus eutropia compared with Chrysosphaerella annulata

Key Differences

• Chilean Dolphin is Near Threatened while is Not Evaluated.

Taxonomic Classification

Rank	Chilean Dolphin
Kingdom	Animalia (สัตว์)	Chromista (โครมิสตา)
Phylum	Chordata (สัตว์มีแกนสันหลัง)	Ochrophyta (Ochrophyta)
Class	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Chrysophyceae (สาหร่ายสีทอง)
Order	Cetacea (Whales & Dolphins)	Ochromonadales (Ochromonadales)
Family	Delphinidae (Oceanic Dolphins)	Paraphysomonadaceae
Genus	Cephalorhynchus	Chrysosphaerella
Species	Cephalorhynchus eutropia	Chrysosphaerella annulata

Conservation Status

Chilean Dolphin

NT — Near Threatened

NE — Not Evaluated

Physical Characteristics

Attribute	Chilean Dolphin
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Chilean Dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway and Sweden.

Chilean Dolphin

The Chilean Dolphin (Cephalorhynchus eutropia) is a species in the genus Cephalorhynchus. It is currently classified as Near Threatened on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

Chrysosphaerella annulata is a colonial freshwater chrysophyte microalga in the genus Chrysosphaerella, class Chrysophyceae. Unlike unicellular loricate chrysophytes, Chrysosphaerella species form spherical or ellipsoidal free-floating colonies in which individual cells are embedded in a common gelatinous matrix. The individual cells bear long siliceous scales with distinctive ring-like or annular structures — referenced by the species epithet annulata — projecting outward from the colony surface, giving the colony a spiny appearance under microscopy. These siliceous scales are species-specific and their morphology, as revealed through electron microscopy, is the primary character for identifying Chrysosphaerella species. C. annulata has been recorded from Norwegian and Swedish freshwater environments, consistent with the Scandinavian emphasis in chrysophyte research and the high diversity of chrysophytes in boreal freshwater systems. Chrysosphaerella colonies are planktonic, inhabiting the limnetic zone of oligotrophic to mesotrophic lakes where they may form locally conspicuous populations during favorable conditions. The species uses chlorophylls a and c with fucoxanthin for photosynthesis, contributing to primary production. Chrysosphaerella scales can accumulate in lake sediments, providing a record of past community composition and environmental conditions. C. annulata has not been assessed under IUCN criteria and is classified as Not Evaluated. Its documentation contributes to understanding the diversity of colonial chrysophyte forms in northern European freshwater ecosystems.