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20 pencil urchins species
Eucidaris thouarsii
Eucidaris metularia
Cidaris cidaris
Hesperocidaris asteriscus
Tretocidaris bartletti
Cidaris abyssicola
Cidaris rugosa
Stylocidaris affinis
Stylocidaris lineata
Histocidaris variabilis
Austrocidaris canaliculata
Prionocidaris hawaiiensis
Stereocidaris leucacantha
Eucidaris tribuloides
Chondrocidaris gigantea
Prionocidaris thomasi
Stereocidaris hawaiiensis
Stylocidaris rufa
Stylocidaris calacantha
Acanthocidaris hastigera
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