---
title: "Giant Acorn Barnacle"
description: "Balanus nubilus — Autres animaux. Balanus nubilus, commonly called the giant acorn barnacle, is the world's largest barnacle, reaching a diameter of 15 cm (6 in) and a height of up to 30 cm (12 in), and containing the largest known muscle fibres."
canonical: https://animalchecklist.com/fr/animal/giant-acorn-barnacle
last_updated: 2026-09-20
---

# Giant Acorn Barnacle

> Balanus nubilus — Autres animaux. Balanus nubilus, commonly called the giant acorn barnacle, is the world's largest barnacle, reaching a diameter of 15 cm (6 in) and a height of up to 30 cm (12 in), and containing the largest known muscle fibres.

- Scientific name: *Balanus nubilus*
- Category: `other` (Autres animaux)
- Habitats: `sea` (Mer et côte)
- iNaturalist observations: 2507
- Wikidata: [Q4300190](https://www.wikidata.org/wiki/Q4300190)
- iNaturalist taxon: [49127](https://www.inaturalist.org/taxa/49127)

## Names

- en: Giant Acorn Barnacle

## Countries with the most observations

US (786), CA (461)

## Summary

Balanus nubilus, commonly called the giant acorn barnacle, is the world's largest barnacle, reaching a diameter of 15 cm (6 in) and a height of up to 30 cm (12 in), and containing the largest known muscle fibres.

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

## Photo

![Giant Acorn Barnacle](https://animalchecklist.com/img/animals/giant-acorn-barnacle/medium.jpg)

Photo: Sophia Slater · CC0 · inaturalist — https://www.inaturalist.org/observations/251271038

## Machine access

`GET https://animalchecklist.com/api/v1/animals/giant-acorn-barnacle?lang=fr` — see [openapi.json](https://animalchecklist.com/openapi.json).