ArbaciaArbacia is a genus of sea urchins, widespread in the Atlantic and eastern Pacific oceans.SpeciesAccording to the World Register of Marine Species this genus includes the following species: Arbacia abiquaensis Linder, Durham & Orr, 1988 †Arbacia crenulata Kier, 1963 † Arbacia dufresnii Arbacia lixula Arbacia nigra Molina, 1782Arbacia punctulata Arbacia rivuli Cooke, 1941a † Arbacia spatuligera Arbacia stellata Arbacia waccamaw Cooke, 1941a †