Coastal Silver-stiletto vs Lumpy Bracket

Acrosathe annulata compared with Trametes gibbosa

Taxonomic Classification

Rank	Coastal Silver-stiletto	Lumpy Bracket
Kingdom	Animalia (動物)	Fungi (菌界)
Phylum	Arthropoda (節足動物)	Basidiomycota (担子菌門)
Class	Insecta (昆虫)	Agaricomycetes (真正担子菌綱)
Order	Diptera (ハエ目)	Polyporales (多孔菌目)
Family	Therevidae	Polyporaceae
Genus	Acrosathe	Trametes
Species	Acrosathe annulata	Trametes gibbosa

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

Lumpy Bracket

LC — Least Concern

Physical Characteristics

Attribute	Coastal Silver-stiletto	Lumpy Bracket
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Coastal Silver-stiletto

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Lumpy Bracket

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Widely distributed across Asia (Taiwan), Europe (5 countries), and North America (United States).

Coastal Silver-stiletto

Coastal silver stiletto (Acrosathe annulata) is a slender robber fly in the family Therevidae, native to northwestern Europe, including the United Kingdom, France, the Netherlands, Belgium, and Scandinavia. Adults are found on coastal sand dunes and sandy heathland, where they perch on bare sand to ambush small flying insects. Stiletto flies in the family Therevidae are characterised by a slender body, long pointed abdomen, and predatory habits; adults prey on a variety of small dipterans and other flying insects during warm, sunny periods. Larvae develop in sandy soil, where they are also predatory, feeding on other invertebrate larvae. Acrosathe annulata is a habitat specialist restricted to open, sandy coastal habitats with sparse vegetation—environments that have declined substantially across northwestern Europe due to dune stabilisation, recreational disturbance, and the cessation of traditional dune management. The IUCN lists it as Least Concern, though regional conservation bodies in the United Kingdom have flagged population declines. It is considered an indicator of high-quality coastal sand dune habitats and is monitored through national invertebrate surveys.