Vaquita

https://faunafocus.com/home/july-2017/#jp-carousel-1714

The vaquita is believed to represent a relict population of an ancestral species.

The vaquita is believed to represent a relict population of an ancestral species, most clearly related to Burmeister’s porpoise, that crossed the equator from the Southern Hemisphere during a period of Pleistocene cooling. Genetic analyses have corroborated this interpretation. Affinities of the axial skeleton and external morphometry suggest that Phocoena sinus evolved from a Pleistocene stock of Burmeister’s porpoise (Phocoena spinipinnis.)

Sources: (Brownell, 1982; NOAA, 2008; Norris & McFarland, 1958; Rojas-Bracho, Reeves, & Jaramillo-Legorreta, 2006; Rosel & Rojas-Brach0, 1999)
Image: IrishErlina

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