Gesäumtes Drehzahnmoos vs Coastal Silver-stiletto

Tortula marginata compared with Acrosathe annulata

Key Differences

Gesäumtes Drehzahnmoos is Endangered while Coastal Silver-stiletto is Least Concern.

Taxonomic Classification

Rank	Gesäumtes Drehzahnmoos	Coastal Silver-stiletto
Kingdom	Plantae (Pflanzen)	Animalia (Tier)
Phylum	Bryophyta	Arthropoda (Gliederfüßer)
Class	Bryopsida (Bryopsida)	Insecta (Insekten)
Order	Pottiales (Pottiales)	Diptera (Zweiflügler)
Family	Pottiaceae	Therevidae
Genus	Tortula	Acrosathe
Species	Tortula marginata	Acrosathe annulata

Conservation Status

Gesäumtes Drehzahnmoos

EN — Endangered

Coastal Silver-stiletto

LC — Least Concern

Physical Characteristics

Attribute	Gesäumtes Drehzahnmoos	Coastal Silver-stiletto
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Gesäumtes Drehzahnmoos

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests spanning the Australasia and Oceanian realms.

Range

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

Coastal Silver-stiletto

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Gesäumtes Drehzahnmoos

The Bordered Screw-moss (Tortula marginata) is a species in the genus Tortula. It is currently classified as Endangered on the IUCN Red List. Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests spanning the Australasia and Oceanian realms.

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.