Coastal Silver-stiletto vs Common Foxglove

Acrosathe annulata compared with Digitalis purpurea

Key Differences

Coastal Silver-stiletto is Least Concern while Common Foxglove is Not Evaluated.

Taxonomic Classification

Rank	Coastal Silver-stiletto	Common Foxglove
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Arthropoda (Arthropods)	Magnoliophyta (Flowering Plants)
Class	Insecta (Insects)	Magnoliopsida (Dicots)
Order	Diptera (Diptera)	Lamiales (Lamiales)
Family	Therevidae	Plantaginaceae
Genus	Acrosathe	Digitalis
Species	Acrosathe annulata	Digitalis purpurea

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

Common Foxglove

NE — Not Evaluated

Physical Characteristics

Attribute	Coastal Silver-stiletto	Common Foxglove
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 Foxglove

Habitat

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

Range

Widely distributed across Africa (Zimbabwe), Asia (5 countries), Europe (16 countries), North America (4 countries), Oceania and the Pacific (Australia, New Zealand), and South America (5 countries).

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 Foxglove

<em>Digitalis purpurea</em> is a biennial or short-lived perennial plant in the family Plantaginaceae, order Lamiales, commonly known as common foxglove. This species is widely cultivated as an ornamental plant and has been naturalized broadly across the globe, with presence documented across Africa, Asia, Europe, North America, Oceania, and South America. <em>Digitalis purpurea</em> typically grows in open woodlands, woodland clearings, hillsides, and disturbed ground, particularly on acidic, well-drained soils. In its first year, the plant forms a rosette of large, softly hairy leaves; in its second year it produces a tall flower spike, often exceeding one meter, bearing distinctive tubular, purple-pink flowers with spotted throats. The flowers are adapted for pollination by bumblebees. The plant contains potent cardiac glycosides, particularly digitoxin and digoxin, compounds that have been critically important in the development of heart failure medications. Despite its medicinal importance, the plant is toxic if ingested. Biological traits of this species remain poorly documented in the scientific literature.