We report the first record of Ramari's beaked whale (Mesoplodon eueu) from the temperate Southwestern Atlantic. Our analysis is based on an adult female and a plausibly associated calf/juvenile that stranded on the coast of Canelones Department, Uruguay. The species of the two individuals was identified via a combination of morphometric and molecular mitochondrial data and provide new insights into the Ramari's beaked whale, including previously unknown polymorphisms in the mitochondrial genome and a re-estimated date of divergence from Mesoplodon mirus at 2.5902 Mya.

On 27 November 2011, a whale resembling a True's beaked whale, Mesoplodon mirus, was found stranded on the South Island of New Zealand. Sequencing of two mitochondrial regions (cytochrome b and mtDNA control region) confirmed species identification as a True's beaked whale that was genetically identified as female. Further examination of the carcass found that the whale was pregnant although decomposition excluded determination of the age of the foetus. This specimen is confirmed as the first record of the species in New Zealand further supporting New Zealand as a whale stranding hotspot.