---
title: "Horned Nudibranch"
description: "Hermissenda crassicornis — Andere dieren. Hermissenda crassicornis, also known as the opalescent nudibranch or thick-horned nudibranch, is a species of brightly coloured, sea slug or nudibranch, a marine gastropod mollusc in the family Facelinidae."
canonical: https://animalchecklist.com/nl/animal/horned-nudibranch
last_updated: 2026-09-20
---

# Horned Nudibranch

> Hermissenda crassicornis — Andere dieren. Hermissenda crassicornis, also known as the opalescent nudibranch or thick-horned nudibranch, is a species of brightly coloured, sea slug or nudibranch, a marine gastropod mollusc in the family Facelinidae.

- Scientific name: *Hermissenda crassicornis*
- Category: `other` (Andere dieren)
- Habitats: `sea` (Zee en kust)
- iNaturalist observations: 18036
- Wikidata: [Q522625](https://www.wikidata.org/wiki/Q522625)
- iNaturalist taxon: [495552](https://www.inaturalist.org/taxa/495552)

## Names

- en: Horned Nudibranch

## Countries with the most observations

US (15197), CA (2462)

## Summary

Hermissenda crassicornis, also known as the opalescent nudibranch or thick-horned nudibranch, is a species of brightly coloured, sea slug or nudibranch, a marine gastropod mollusc in the family Facelinidae.

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Hermissenda_crassicornis

## Photo

![Horned Nudibranch](https://animalchecklist.com/img/animals/horned-nudibranch/medium.jpg)

Photo: Jon Eilers · CC0 · inaturalist — https://www.inaturalist.org/observations/40551139

## Machine access

`GET https://animalchecklist.com/api/v1/animals/horned-nudibranch?lang=nl` — see [openapi.json](https://animalchecklist.com/openapi.json).