- English Common Name
- Red Slate Pencil Urchin
- Scientific name
- Heterocentrotus mammillatus
- Taxonomy
- Order: Camarodonta, Family: Echinoidea
- Size
- 6 cm – 7 cm (size of the shell)
- Species Distribution
- Indo-Pacific Ocean
- Okinawan Common Name
- Azamnn-inonatsuiki, akaunah
- Reddish-dark brown thick spines are hollow. It is a nocturnal anima and stays in rock shelters during daytime. At nighttime, Red Slate Pencil Urchin moves around to feed on algae on rocks. This species is also popular as ornamental use, thick and strong spines are used for accessories and wind chimes.
Heterocentrotus mammillatus stays under rocks during daytime
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- Updated June 2017