Cassiduloida

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Translingual

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Cassidulus mitis, one of the Cassiduloida

Etymology

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Cassidulus +‎ -ida

Proper noun

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Cassiduloida

  1. A taxonomic order within the class Echinoidea – certain sea urchins, most extinct since the Mesozoic.

Hypernyms

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Hyponyms

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References

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