Coastal Silver-stiletto vs koala

Acrosathe annulata compared with Phascolarctos cinereus

Key Differences

• Coastal Silver-stiletto is Least Concern while koala is Vulnerable.

Taxonomic Classification

Rank	Coastal Silver-stiletto	koala
Kingdom same	Animalia (حيوانات)	Animalia (حيوانات)
Phylum	Arthropoda (مفصليات الأرجل)	Chordata (حبليات)
Class	Insecta (حشرات)	Mammalia (ثدييات)
Order	Diptera (ذوات الجناحين)	Diprotodontia (ثنائيات الأسنان الأمامية)
Family	Therevidae	Phascolarctidae (Koalas)
Genus	Acrosathe	Phascolarctos (Koalas)
Species	Acrosathe annulata	Phascolarctos cinereus

Evolutionary Relationship

Coastal Silver-stiletto and koala share a common ancestor at the Kingdom level: Animalia. (حيوانات)

Conservation Status

Coastal Silver-stiletto

LC — Least Concern

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Coastal Silver-stiletto	koala
Diet	—	Herbivore
Average Lifespan	—	15 years
Average Length	—	75 cm
Average Weight	—	10.0 kg

Habitat & Geographic Range

Coastal Silver-stiletto

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

koala

Habitat

Typically found in grasslands, forests, and vegetated habitats.

Range

Found in Australia. Currently classified as Vulnerable 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.

koala

Iconic marsupial of eastern and southeastern Australia, koalas weigh up to 15 kg and spend up to 22 hours daily sleeping to conserve energy from their low-calorie eucalyptus leaf diet. Highly specialized to process toxic eucalyptus compounds that would kill most other mammals, they have gut microbiomes uniquely adapted for detoxification. Listed as Endangered in 2022, with populations decimated by chlamydia disease, habitat clearing, and climate change.