#4820 · 🐌 snails, slugs & other molluscs
California Seahare
🇳🇱 Californische zeehaas ·Aplysia californica
🐌 Snails, slugs & other molluscs 📍 outside Europe
9 photos from iNaturalist (Creative Commons) · credits & licences
what is it?
The California sea hare , also known as the California sea slug , scientific name Aplysia californica , is a species of sea slug, specifically a sea hare, a marine opisthobranch gastropod mollusk in the sea hare family, Aplysiidae.
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.
- 10,250 observations worldwide on iNaturalist.
- Scientifically named by James Graham Cooper in 1863 (163 years ago).
fact sheet
- English
- California Seahare
- Nederlands
- Californische zeehaas
- scientific name
- Aplysia californica
- class
- Gastropoda
- order
- Aplysiida
- family
- Aplysiidae
- sightings in NL
- 0
- sightings worldwide
- 10,250
- GBIF records in NL
- 0
- weight
- —
- length
- —
- lifespan
- —
- named
- 1863 by James Graham Cooper
relatives· Aplysiidae
Sources: iNaturalist taxon 48655, Wikidata Q1698916, GBIF 5191261, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.