Slate pencil urchin

Slate pencil urchin (named after slate pencil) is a common name for several sea urchin species with blunt spines:

Eucidaris, a genus with several tropical species, especially:
- Eucidaris thouarsii, an East Pacific species
- Eucidaris tribuloides, an Atlantic species
Heterocentrotus, a genus with two Indo-Pacific species

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