A DIVERGENT mtDNA LINEAGE AMONG MESOPLODON BEAKED WHALES: MOLECULAR EVIDENCE FOR A NEW SPECIES IN THE TROPICAL PACIFIC?

DNA sequence data enable not only the inference of evolutionary relationships and population histories but also represent a powerful tool for uncovering hidden biodiversity, an approach that has become known as "DNA taxonomy" (Dalebout eta/. 2002, Meegasku.mhura.eta/. 2002, Hebert eta/. 2004). The application of DNA taxonomy to beaked whales (Ziphiidae), the least known of all cetacean families, has led to some significant discoveries in recent years. These include the description of a new species from the North Pacific {Mesop/odon perrini; Dalebout et a/. 2002), the

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