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in 1915 was simply the "nisto" (juvenile) stage of S. pygmaeus. Applying the principle of first reviser, Bouvier established that S. pygmaeus would be the valid name, over S. immaturus. Although S. pygmaeus is not rare in the Mediterranean Sea, its presence there was overlooked for decades, due to the confusion between it and the more conspicuous S. arctus, whose immature form S. pygmaeus was often

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