Mugil cephalus Linnaeus, 1758, European seas. It has been suggested that several species, initially distinguished by slight differences in morphological features, fin ray counts, dentition, and fin coloration, are synonymous with Mugil cephalus. Some authors have indicated that the concept of Mugil cephalus as a widespread, polymorphic species may be incorrect. According to comparative analyses of the morphometrics, isozymes, and mitochondrial DNA of populations of Mugil cephalus from around the world, however, the variation between populations is not large enough to indicate definitively that they are differentiated species.
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