- English Common Name
- Burrowing Urchin
- Scientific name
- Echinometra mathaei
- Taxonomy
- Order: Camarodonta, Family: Echinometridae
- Size
- About 4 cm
- Species Distribution
- Indo-West Pacific
- Okinawan Common Name
- Una, Unah
- Unlike other sea urchins, its shell is long oval shape, and the Japanese common name came from its characteristic shape. It used to be only one species; however, a recent study revealed that it has four different types based on ecology and morphology differences. These types are assumed to be different species, but the scientific names are not given to each type: Undescribed species.
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- Updated October 2018
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