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#4805 · 🐌 snails, slugs & other molluscs

Opalescent Nudibranch

Hermissenda opalescens

🐌 Snails, slugs & other molluscs 📍 outside Europe
8 photos from iNaturalist (Creative Commons) · credits & licences
  1. 1. © Robin Gwen Agarwal · CC BY-NC 4.0
  2. 2. © Ken Bondy · CC BY-NC-SA 4.0
  3. 3. © Donna Pomeroy · CC BY-NC 4.0
  4. 4. © Donna Pomeroy · CC BY-NC 4.0
  5. 5. © Donna Pomeroy · CC BY-NC 4.0
  6. 6. © juliamarkey · CC BY-NC 4.0
  7. 7. © Donna Pomeroy · CC BY-NC 4.0
  8. 8. © Donna Pomeroy · CC BY-NC 4.0
Opalescent Nudibranch, photo 1 of 8
1/8 © Robin Gwen Agarwal · CC BY-NC 4.0

what is it?

Hermissenda opalescens is a species of brightly coloured sea slug or nudibranch, a marine gastropod mollusc in the family Facelinidae.

base stats

  • NL sightings 0iNaturalist, research grade
  • worldwide 22,017iNaturalist 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

  • No confirmed wild sightings in the Netherlands on iNaturalist: you'd have to travel for this one.
  • 22,017 observations worldwide on iNaturalist.

fact sheet

English
Opalescent Nudibranch
scientific name
Hermissenda opalescens
class
Gastropoda
order
Nudibranchia
family
Myrrhinidae
sightings in NL
0
sightings worldwide
22,017
GBIF records in NL
0
weight
—
length
—
lifespan
—

relatives· Myrrhinidae

Sources: iNaturalist taxon 494603, Wikidata Q25000955, GBIF 8542531, Wikipedia (EN). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.

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