Supplementary Material for: The Karyotype of Blainville’s Beaked Whale, <b><i>Mesoplodon densirostris</i></b>

The karyotype of the Odontocete whale, <i>Mesoplodon densirostris</i>, has not been previously reported. The chromosome number is determined to be 2n = 42, and the karyotype is presented using G-, C-, and nucleolar organizer region (NOR) banding. The findings include NOR regions on 2 chromosomes, regions of heterochromatic variation, a large block of heterochromatin on the X chromosome, and a relatively large Y chromosome. The karyotype is compared to published karyograms of 2 other species of <i>Mesoplodon</i>.