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Several western Atlantic species of Chelidonura have been described mainly based on differences in colour pattern. Sequence data from two mitochondrial [cytochrome oxidase I (COI), 16S] genes and a nuclear [histone 3 (H3)] gene have revealed that all colour forms previously recognized from across the Caribbean, Bahamas, and Bermuda belong to the same species, Chelidonura berolina. However, several...