Azorean predacious diving beetle vs

Agabus godmanni compared with Chrysosphaerella annulata

Key Differences

• Azorean predacious diving beetle is Endangered while is Not Evaluated.

Taxonomic Classification

Rank	Azorean predacious diving beetle
Kingdom	Animalia (动物界)	Chromista (色藻界)
Phylum	Arthropoda (节肢动物门)	Ochrophyta (淡色藻门)
Class	Insecta (昆蟲綱)	Chrysophyceae (丽生菌纲)
Order	Coleoptera (鞘翅目)	Ochromonadales (棕鞭藻目)
Family	Dytiscidae	Paraphysomonadaceae
Genus	Agabus	Chrysosphaerella
Species	Agabus godmanni	Chrysosphaerella annulata

Conservation Status

Azorean predacious diving beetle

EN — Endangered

NE — Not Evaluated

Physical Characteristics

Attribute	Azorean predacious diving beetle
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Azorean predacious diving beetle

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

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

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway and Sweden.

Azorean predacious diving beetle

The Azorean predacious diving beetle (Agabus godmanni) is a species in the genus Agabus. It is currently classified as Endangered on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

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.