#4558 · 🦀 crabs & other crustaceans
Thatched Barnacle
Semibalanus cariosus
🦀 Crabs & other crustaceans 📍 outside Europe
📍 Vancouver Island, BC
📍 Juan de Fuca Strait, Victoria, BC, CA
📍 Clallam County, WA, USA
📍 Salish Sea, Oak Bay, BC, CA
📍 Sitka, AK, USA
📍 Clallam County
📍 North Pacific Ocean, Neskowin, OR, US
10 photos from iNaturalist (Creative Commons) · credits & licences
- 1. © Alison Young · CC BY-NC 4.0
- 2. © Alison Young · CC BY-NC 4.0
- 3. © Paul Norwood · CC BY-NC 4.0
- 4. Vancouver Island, BC:© Minette Layne-Worthey · CC BY-NC-SA 4.0
- 5. Juan de Fuca Strait, Victoria, BC, CA:© Shelby Connelly · CC BY-NC 4.0
- 6. Clallam County, WA, USA:© pearsone · CC BY-NC 4.0
- 7. Salish Sea, Oak Bay, BC, CA:© no rights reserved · CC0
- 8. Sitka, AK, USA:© Matt Goff · CC BY-NC-SA 4.0
- 9. Clallam County:© starlings_song · CC BY-NC 4.0
- 10. North Pacific Ocean, Neskowin, OR, US:© Sorrel · CC BY 4.0
what is it?
Semibalanus cariosus , commonly known as the thatched barnacle , rock barnacle or horse barnacle , is a species of acorn barnacle occurring in the northern Pacific Ocean.
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.
- 6,380 observations worldwide on iNaturalist.
- Scientifically named by Peter Simon Pallas in 1788 (238 years ago).
fact sheet
- English
- Thatched Barnacle
- scientific name
- Semibalanus cariosus
- class
- Hexanauplia
- order
- Balanomorpha
- family
- Balanidae
- sightings in NL
- 0
- sightings worldwide
- 6,380
- GBIF records in NL
- 0
- weight
- —
- length
- —
- lifespan
- —
- named
- 1788 by Peter Simon Pallas
relatives· Balanidae
Sources: iNaturalist taxon 47658, Wikidata Q4295445, GBIF 2115787, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.