#4629 · 🐌 snails, slugs & other molluscs
Johnston's balloon eolis
🇳🇱 Slanke knotsslak ·Tergipes tergipes
🐌 Snails, slugs & other molluscs 📍 in the Netherlands
7 photos from iNaturalist (Creative Commons) · credits & licences
what is it?
Tergipes tergipes is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Fionidae.
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
- Spotted 55 times in the Netherlands on iNaturalist.
- 389 observations worldwide on iNaturalist.
fact sheet
- English
- Johnston's balloon eolis
- Nederlands
- Slanke knotsslak
- scientific name
- Tergipes tergipes
- class
- Gastropoda
- order
- Nudibranchia
- family
- Tergipedidae
- sightings in NL
- 55
- sightings in Europe
- 247
- sightings worldwide
- 389
- GBIF records in NL
- 882
- weight
- —
- length
- —
- lifespan
- —
Sources: iNaturalist taxon 118973, Wikidata Q3788445, GBIF 2292363, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.