| Heterocentrotus trigonarius | |
|---|---|
|  | |
| Scientific classification  | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Echinodermata | 
| Class: | Echinoidea | 
| Order: | Camarodonta | 
| Family: | Echinometridae | 
| Genus: | Heterocentrotus | 
| Species: | H. trigonarius | 
| Binomial name | |
| Heterocentrotus trigonarius (Lamarck, 1816) | |
Heterocentrotus trigonarius,[1] commonly known as the slate pencil urchin or red slate pencil urchin,[2] is found in the tropical waters of the Indo-Pacific region.[1] Heterocentrotus mamillatus is a similar, related species.[2]
Heterocentrotus trigonarius can grow to 30 cm (12 in) in diameter (spine-to-spine). The spines are potentially harmful to humans if trodden on.[2]
References

Wikimedia Commons has media related to Heterocentrotus trigonarius.
- 1 2 Kroh A, Mooi R, eds. (2023). "Heterocentrotus trigonarius (Lamarck, 1816)". World Echinoidea Database. World Register of Marine Species. Retrieved 22 October 2023.
- 1 2 3 "Critter of the Week: The tropical slate pencil urchin". NIWA. Retrieved 22 October 2023.
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