---
title: "Blue-black Urchin"
description: "Echinothrix diadema — Outros animais. The diadema urchin or blue-black urchin (Echinothrix diadema) is a species of tropical sea urchin, member of the Diadematidae family."
canonical: https://animalchecklist.com/pt/animal/blue-black-urchin
last_updated: 2026-09-20
---

# Blue-black Urchin

> Echinothrix diadema — Outros animais. The diadema urchin or blue-black urchin (Echinothrix diadema) is a species of tropical sea urchin, member of the Diadematidae family.

- Scientific name: *Echinothrix diadema*
- Category: `other` (Outros animais)
- Habitats: `sea` (Mar e costa)
- iNaturalist observations: 1016
- Wikidata: [Q2720518](https://www.wikidata.org/wiki/Q2720518)
- iNaturalist taxon: [122164](https://www.inaturalist.org/taxa/122164)

## Names

- en: Blue-black Urchin
- fr: Oursin bleu-noir

## Countries with the most observations

US (443), TW (24), KE (18), PH (17), GU (16), PF (15), MV (13), WF (12), ZA (12), ID (11), MP (11), RE (10)

## Summary

The diadema urchin or blue-black urchin (Echinothrix diadema) is a species of tropical sea urchin, member of the Diadematidae family.

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

## Photo

![Blue-black Urchin](https://animalchecklist.com/img/animals/blue-black-urchin/medium.jpg)

Photo: Kyle Nessen · CC0 · inaturalist — https://www.inaturalist.org/observations/195391235

## Machine access

`GET https://animalchecklist.com/api/v1/animals/blue-black-urchin?lang=pt` — see [openapi.json](https://animalchecklist.com/openapi.json).