#4948 · 🪼 jellyfish, starfish, worms & co

Kroontjesworm

Hydroides ezoensis

🪼 Jellyfish, starfish, worms & co 📍 in the Netherlands

10 photos from iNaturalist (Creative Commons) · credits & licences

1. © Leslie Harris · CC BY-NC 4.0
2. © Leslie Harris · CC BY-NC 4.0
3. © Leslie Harris · CC BY-NC 4.0
4. Altona Bay, Williamstown, AU:© Thomas Turner · CC BY-NC 4.0
5. Le Port, Le Havre, France:© Frédéric ANDRE · CC BY-NC 4.0
6. Schouwen-Duiveland, Pays-Bas:© Frédéric ANDRE · CC BY-NC 4.0
7. Altona Bay, Williamstown, AU:© Thomas Turner · CC BY-NC 4.0
8. Schouwen-Duiveland, Pays-Bas:© Frédéric ANDRE · CC BY-NC 4.0
9. Altona Bay, Williamstown, AU:© Thomas Turner · CC BY-NC 4.0
10. Schouwen-Duiveland, Pays-Bas:© Frédéric ANDRE · CC BY-NC 4.0

what is it?

Hydroides ezoensis is a species of tube-forming annelid worm in the family Serpulidae. It is native to the temperate northern Pacific and the central Indo-Pacific and is found in the intertidal zone and on submerged rocks, shells, pilings, jetties and boats.

base stats

NL sightings 6iNaturalist, research grade
worldwide 27iNaturalist observations

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 6 times in the Netherlands on iNaturalist.
27 observations worldwide on iNaturalist.
Scientifically named in 1934 (92 years ago).

fact sheet

Nederlands: Kroontjesworm
scientific name: Hydroides ezoensis
class: Polychaeta
order: Sabellida
family: Serpulidae
sightings in NL: 6
sightings in Europe: 7
sightings worldwide: 27
GBIF records in NL: 10
weight: —
length: —
lifespan: —
named: 1934

relatives· Serpulidae

Sources: iNaturalist taxon 390784, Wikidata Q2842296, GBIF 2328383, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.