Brown Diving Beetle vs Concentric Boulder Lichen

Agabus brunneus compared with Porpidia crustulata

Key Differences

Brown Diving Beetle is Extinct while Concentric Boulder Lichen is Vulnerable.

Taxonomic Classification

Rank	Brown Diving Beetle	Concentric Boulder Lichen
Kingdom	Animalia (동물)	Fungi (균계)
Phylum	Arthropoda (절지동물)	Ascomycota (자낭균류)
Class	Insecta (곤충)	Lecanoromycetes (요강버섯강)
Order	Coleoptera (딱정벌레목)	Lecideales (Lecideales)
Family	Dytiscidae	Lecideaceae
Genus	Agabus	Porpidia
Species	Agabus brunneus	Porpidia crustulata

Conservation Status

Brown Diving Beetle

EX — Extinct

Concentric Boulder Lichen

VU — Vulnerable

Physical Characteristics

Attribute	Brown Diving Beetle	Concentric Boulder Lichen
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brown Diving Beetle

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium and Sweden.

Concentric Boulder Lichen

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, Sweden, and United States. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Brown Diving Beetle

The Brown Diving Beetle (Agabus brunneus) is a species in the genus Agabus. It is currently classified as Extinct on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

Concentric Boulder Lichen

<em>Porpidia crustulata</em>, commonly known as the Concentric Boulder Lichen, is a crustose lichen in the family Porpidiaceae formed through a symbiotic relationship between a fungal partner (mycobiont) and photosynthetic green algae (photobiont). Like all crustose lichens, it grows tightly appressed to its substrate—typically siliceous or acidic rock surfaces including boulders, cliff faces, and pebbles in open, well-lit habitats—forming thin, grayish to pale thalli marked by scattered black apothecia (reproductive discs). <em>Porpidia crustulata</em> derives nutrition entirely through photosynthesis conducted by its algal partner, requiring no external organic food source. The species has been documented in Denmark, Norway, Portugal, Sweden, and the United States, suggesting a broad boreal to temperate distribution across the Northern Hemisphere. It is currently classified as Vulnerable by the IUCN, indicating significant conservation concern, likely linked to threats including air pollution, acidification, quarrying of rocky habitats, and changes in land use that reduce the availability of suitable substrates. Crustose lichens are typically slow-growing, long-lived organisms with limited capacity for rapid range shifts in response to environmental change. Biological traits such as individual lifespan, growth rates, and reproductive output remain poorly documented at the population level.