subclass
Pencil Urchins
Cidaroidea
Field notes
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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Range
Greener is more native, amber more introduced; paler is less certain. How this was decided
Most observed native pencil urchins All
Native to the US, by observations.
