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Three new species of the genus Sphaerodoridium (Polychaeta) from the Arctic Ocean are described and illustrated. They differ from other closely related species by having more than 10 longitudinal rows of stalked macrotubercles on the dorsum. S. evgenovi sp. n. is characterized by twelve rows of macrotubercles with stout, short columns which are always at the right angle to the dorsal surface and never...
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