#4771 · 🐌 snails, slugs & other molluscs
Purple Topshell
🇳🇱 Genavelde tolhoren ·Steromphala umbilicalis
🐌 Snails, slugs & other molluscs 📍 in Europe, not in NL
7 photos from iNaturalist (Creative Commons) · credits & licences
what is it?
Steromphala umbilicalis , common name the flat top shell , is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
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.
- 4,140 observations worldwide on iNaturalist.
fact sheet
- English
- Purple Topshell
- Nederlands
- Genavelde tolhoren
- scientific name
- Steromphala umbilicalis
- class
- Gastropoda
- order
- Trochida
- family
- Trochidae
- sightings in NL
- 0
- sightings in Europe
- 2,997
- sightings worldwide
- 4,140
- GBIF records in NL
- 81
- weight
- —
- length
- —
- lifespan
- —
relatives· Trochidae
Sources: iNaturalist taxon 711719, Wikidata Q61701164, GBIF 9471950, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.