Heterocentrotus trigonarius - AbsoluteAstronomy.com

Heterocentrotus trigonarius, commonly known as the slate pencil urchin or red slate pencil urchin, is found in the tropical waters of the Indo-Pacific region.

Heterocentrotus mammillatus
Heterocentrotus mammillatus
This urchin, commonly known as the slate pencil urchin, red slate pencil urchin, or red pencil urchin, is found throughout the tropical waters of the Indo-Pacific region, but is most abundant in Hawai‘i...

is a similar, related species.

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