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Eucidaris metularia : ウィキペディア英語版 | Eucidaris metularia
''Eucidaris metularia'', the ten-lined urchin, is a species of sea urchin in the family Cidaridae. It is found in shallow parts of the Indo-Pacific Ocean and is characterised by its sparse covering of banded, flat-tipped spines. ==Description== ''Eucidaris metularia'' is a primitive species of sea urchin and comes from an ancient lineage that has hardly changed over the past 150 million years. The test is robust and somewhat flattened and up to in diameter. The ambulacra are almost straight and have horizontal pairs of pores. The primary spines are few in number, stout with a truncated tip and distinctively banded. The secondary spines surround the primaries and are more numerous, much smaller and flattened.
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