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Cidaroida, also known as pencil urchins, is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
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subclass primitive living order urchins sea ctenocidaridae histocidaridae psychocidaridae miocidaridae polycidaridae cidaris perischoechinoidea mesozoic world register marine species also known
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Cidaroida | related to Sources | World Register | 0.60 | section |
| Cidaroida | related to Sources | Marine Species | 0.60 | section |
| Cidaroida | related to Sources | Cidaroida Claus | 0.60 | section |
| Cidaroida | related to Sources | Barnes | 0.60 | section |
| Cidaroida | related to Sources | Robert | 0.60 | section |
| Cidaroida | related to Sources | Invertebrate Zoology | 0.60 | section |
| Cidaroida | related to Sources | Philadelphia | 0.60 | section |
| Cidaroida | related to Sources | PA | 0.60 | section |
| Cidaroida | related to Sources | Holt-Saunders International | 0.60 | section |
| Cidaroida | related to Sources | ISBN | 0.60 | section |
| Cidaroida | related to Sources | National History Museum | 0.60 | section |
| Cidaroida | related to Sources | Retrieved | 0.60 | section |
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