Coastal Silver-stiletto vs Streamside Swordfern

Acrosathe annulata compared with Nephrolepis rivularis

Key Differences

• Coastal Silver-stiletto is Least Concern while Streamside Swordfern is Not Evaluated.

Taxonomic Classification

Rank	Coastal Silver-stiletto	Streamside Swordfern
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Arthropoda (Arthropods)	Tracheophyta
Class	Insecta (Insects)	Polypodiopsida (Polypodiopsida)
Order	Diptera (Diptera)	Polypodiales (Polypodiales)
Family	Therevidae	Nephrolepidaceae
Genus	Acrosathe	Nephrolepis
Species	Acrosathe annulata	Nephrolepis rivularis

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

Streamside Swordfern

NE — Not Evaluated

Physical Characteristics

Attribute	Coastal Silver-stiletto	Streamside Swordfern
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.

Streamside Swordfern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

Range

Distributed across Brazil, Colombia, and Cuba.

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.