#4766 · 🐌 snails, slugs & other molluscs
Northern Dusky Slug
🇳🇱 Bruine wegslak ·Arion fuscus
8 photos from iNaturalist (Creative Commons) · credits & licences
- 1. © Tomáš Čejka · CC BY-NC 4.0
- 2. © Pekka Malinen · CC BY-NC-SA 4.0
- 3. © nana7mi · CC BY-NC 4.0
- 4. © Thomas · CC0
- 5. © Thomas · CC0
- 6. © hellengarlov · CC BY-NC 4.0
- 7. © Stela Beatričė · CC BY-NC 4.0
- 8. © Alexander Baransky · CC BY-NC 4.0
what is it?
Arion fuscus , also known as the "Dusky Arion", is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs.
base stats
Bars compare against all animals on log scales: up to 300,000 Dutch and 600,000 worldwide sightings (the most-seen species), 150 t (blue whale), 30 m and 400 years (Greenland shark).
fun facts
- No confirmed wild sightings in the Netherlands on iNaturalist: you'd have to travel for this one.
- 6,532 observations worldwide on iNaturalist.
- Scientifically named by Otto Friedrich Müller in 1774 (252 years ago).
fact sheet
- English
- Northern Dusky Slug
- Nederlands
- Bruine wegslak
- scientific name
- Arion fuscus
- class
- Gastropoda
- order
- Stylommatophora
- family
- Arionidae
- IUCN Red List
- LC · least concern
- sightings in NL
- 0
- sightings in Europe
- 2,096
- sightings worldwide
- 6,532
- GBIF records in NL
- 16
- weight
- —
- length
- —
- lifespan
- —
- named
- 1774 by Otto Friedrich Müller
IUCN in Dutch: niet bedreigd. Blank means the sources don't say.
relatives· Arionidae
Sources: iNaturalist taxon 324194, Wikidata Q290431, GBIF 5779438, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.