#4806 · 🐌 snails, slugs & other molluscs
Horned Nudibranch
Hermissenda crassicornis
🐌 Snails, slugs & other molluscs 📍 outside Europe
📍 North Pacific Ocean, Kitimat-Stikine, BC, CA
📍 Bamfield, British Columbia, Canada
📍 Humboldt County, CA, USA
📍 Quadra Island
📍 Sonoma County, CA, USA
📍 West End, Tacoma, WA, USA
10 photos from iNaturalist (Creative Commons) · credits & licences
- 1. © glaciersaremelting · CC BY-NC 4.0
- 2. © Ken-ichi Ueda · CC BY 4.0
- 3. © Robin Gwen Agarwal · CC BY-NC 4.0
- 4. © Minette Layne-Worthey · CC BY-NC-SA 4.0
- 5. North Pacific Ocean, Kitimat-Stikine, BC, CA:© Liam Ragan · CC BY-NC 4.0
- 6. Bamfield, British Columbia, Canada:© Jackson W.F. Chu · CC BY-NC-SA 4.0
- 7. Humboldt County, CA, USA:© Ciara T. McKim · CC BY-NC 4.0
- 8. Quadra Island:© Hakai Institute · CC BY-NC-SA 4.0
- 9. Sonoma County, CA, USA:© Collin Gross · CC BY-NC 4.0
- 10. West End, Tacoma, WA, USA:© Sam Hain · CC BY-NC 4.0
what is it?
Hermissenda crassicornis is a species of brightly coloured, sea slug or nudibranch, a marine gastropod mollusc in the family Facelinidae.
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.
- 19,209 observations worldwide on iNaturalist.
fact sheet
- English
- Horned Nudibranch
- scientific name
- Hermissenda crassicornis
- class
- Gastropoda
- order
- Nudibranchia
- family
- Myrrhinidae
- sightings in NL
- 0
- sightings worldwide
- 19,209
- GBIF records in NL
- 0
- weight
- —
- length
- —
- lifespan
- —
relatives· Myrrhinidae
Sources: iNaturalist taxon 495552, Wikidata Q522625, GBIF 2292241, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.