Coastal Silver-stiletto vs Three-lined Soldier

Acrosathe annulata compared with Oxycera trilineata

Key Differences

• Coastal Silver-stiletto is Least Concern while Three-lined Soldier is Endangered.

Taxonomic Classification

Rank	Coastal Silver-stiletto	Three-lined Soldier
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Arthropoda (Arthropods)	Arthropoda (Arthropods)
Class same	Insecta (Insects)	Insecta (Insects)
Order same	Diptera (Diptera)	Diptera (Diptera)
Family	Therevidae	Stratiomyidae
Genus	Acrosathe	Oxycera
Species	Acrosathe annulata	Oxycera trilineata

Evolutionary Relationship

Coastal Silver-stiletto and Three-lined Soldier share a common ancestor at the Order level: Diptera. (Diptera)

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

Three-lined Soldier

EN — Endangered

Physical Characteristics

Attribute	Coastal Silver-stiletto	Three-lined Soldier
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.

Three-lined Soldier

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

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

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.

Shared Countries

Both species can be found in 4 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden