Coastal Silver-stiletto vs Common Funnel

Acrosathe annulata compared with Infundibulicybe gibba

Taxonomic Classification

Rank	Coastal Silver-stiletto	Common Funnel
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Arthropoda (Arthropods)	Basidiomycota (Club Fungi)
Class	Insecta (Insects)	Agaricomycetes (Mushrooms)
Order	Diptera (Diptera)	Agaricales (Gilled Mushrooms)
Family	Therevidae	Tricholomataceae
Genus	Acrosathe	Infundibulicybe
Species	Acrosathe annulata	Infundibulicybe gibba

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

Common Funnel

LC — Least Concern

Physical Characteristics

Attribute	Coastal Silver-stiletto	Common Funnel
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.

Common Funnel

Habitat

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

Range

Distributed across Denmark, Norway, Sweden, and 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.

Common Funnel

<em>Infundibulicybe gibba</em>, commonly known as the common funnel, is a saprotrophic fungus in the family Tricholomataceae. It has been documented in Denmark, Norway, Sweden, and the United States, and is known to occur more broadly across temperate regions of the Northern Hemisphere. The species typically inhabits forest floors and areas with decomposing wood and leaf litter, where it plays a key role in breaking down organic matter and recycling nutrients. <em>Infundibulicybe gibba</em> produces characteristic funnel-shaped fruiting bodies, typically pale buff to pinkish-tan in color, with deeply decurrent gills running down the stipe. It is assessed as Least Concern, reflecting its wide distribution and occurrence across a variety of woodland habitats. The common funnel is a common and recognizable species in temperate forests throughout its range. Biological traits of this species remain poorly documented in the scientific literature. As a saprotroph, it contributes to decomposition processes in forest ecosystems and is often found growing in arcs or rings in leaf litter and grassy clearings within woodland areas.