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Atelostomata : ウィキペディア英語版 | Atelostomata
The Atelostomata are a superorder of sea urchins. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known heart urchins, as well as some less familiar and extinct forms. == List of orders ==
* order ''Holasteroida'' (Durham & Melville, 1957) * order ''Spatangoida'' (L. Agassiz, 1840)
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