The Diadematacea are a superorder of sea urchins. Unlike most other sea urchins, they generally have hollow spines. The tubercles on their tests are perforated, and most species possess gills.
Superorder
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Les Diadematacea sont un super-ordre d’oursins (échinodermes) réguliers de la sous-classe des Euechinoidea.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).