Coastal Silver-stiletto vs common fleabane

Acrosathe annulata compared with Pulicaria dysenterica

Taxonomic Classification

Rank	Coastal Silver-stiletto	common fleabane
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Arthropoda (Arthropods)	Magnoliophyta (Flowering Plants)
Class	Insecta (Insects)	Magnoliopsida (Dicots)
Order	Diptera (Diptera)	Asterales (Daisies & Sunflowers)
Family	Therevidae	Asteraceae (Daisy Family)
Genus	Acrosathe	Pulicaria
Species	Acrosathe annulata	Pulicaria dysenterica

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

common fleabane

LC — Least Concern

Physical Characteristics

Attribute	Coastal Silver-stiletto	common fleabane
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 fleabane

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Found across Europe (7 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.

common fleabane

<em>Pulicaria dysenterica</em> is a perennial herbaceous plant belonging to the family Asteraceae within the order Asterales. Commonly known as common fleabane or elecampane, this species typically colonizes damp, disturbed habitats including marshes, riverbanks, roadsides, and wet meadows. It is classified as Least Concern on the IUCN Red List, indicating stable and widespread populations. <em>Pulicaria dysenterica</em> is native to Europe and also occurs in the United States. The plant typically produces branching, woolly-stemmed growth reaching up to 60 centimeters in height, bearing yellow daisy-like flowerheads from mid to late summer that attract a range of pollinating insects. Its leaves are clasping and softly hairy, a characteristic that gives the plant a distinctly woolly appearance. Historically, the species was used in traditional medicine and as an insect repellent, with the common name reflecting both its reputed medicinal properties and the flea-deterring use of its dried foliage. Biological traits of this species remain poorly documented in the scientific literature.