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Zenocentrotus kellersi is a species of sea urchin in the family Echinometridae, described by Austin H. Clark in 1931 from specimens collected on the island of Niuafo'ou in Tonga. It is a regular urchin found in Indo-Pacific reef environments. The genus Zenocentrotus is distinguished by specific morp...
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Arbacia spatuligera is a South American arbaciid sea urchin described by Valenciennes in 1846 and distinguished by flattened, spatulate oral spines.
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Amblypneustes griseus is Blainville's 1825 name for an Australian temnopleurid now accepted as Amblypneustes ovum, originally described in 1816.
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Arbaciella elegans is a minute arbaciid described by Mortensen in 1910, notable for maturing below 10 millimetres and resembling juvenile Arbacia.
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