Arbacia is a genus of sea urchins, widespread in the Atlantic and eastern Pacific oceans. Species According to the World Register of Marine Species : Arbacia crenulata Kier, 1963 † (Miocene, east coast of USA) Arbacia dufresnii (Blainville, 1825) (Patagonia and Antarctica) Arbacia lixula (Linnaeus, 1758) (Mediterranean) Arbacia punctulata (Lamarck, 1816) (Caribbean) Arbacia rivuli Cooke, 1941a † (Pliocene, east coast of USA) Arbacia spatuligera (Valenciennes, 1846) (Peru and Chile) Arbacia stellata (Blainville, 1825; ?Gmelin, 1788) (East Pacific) Arbacia waccamaw Cooke, 1941a † (Pliocene, east coast of USA) References Arbacioida