DistributionRead full entry
The subspecies occupies a range of roughly 10 million km² in the eastern tropical Pacific, extending from about the equator to about 20° North latitude and from the coast of Mexico and Central America west to about 135° West longitude. The core of the range (highest densities of dolphins) is north of 5° N and east of 130° W (Perrin et al. 1991).
Subpopulations likely exist within the subspecies; spinners off northern Mexico (the "Tres Marias spinners") are longer on average than those farther to the south and offshore (Perryman and Westlake 1998), and peak timing of reproductive seasonality varies spatially within the range (Barlow 1984).
The map shows where the species may occur based on oceanography. The species has not been recorded for all the states within the hypothetical range as shown on the map. States for which confirmed records of the species exist are included in the list of native range states.