SINCE 1828
Bothriocidaris
noun
Both·rio·cid·a·ris
| \ -ˈsidərə̇s\
Definition of Bothriocidaris
: a genus (coextensive with the family Bothriocidaridae and order Bothriocidaroida) of extinct primitive simple sea urchins that somewhat resemble Cystoidea and are known from the Ordovician of the Russo-Baltic area
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