ɐ sˈɛkənd ɪstˈæblɪʃt pˌɑːpjʊlˈeɪʃən ʌvðə spˈiːsiːz ɪn kˌælɪfˈoːɹniə ɪz nˈaʊ səspˈɛktᵻd, fˈɑːloʊɪŋ ðə mˈɑːɹtʃ tˈuː θˈaʊzənd sˈɪkstiːn dɪskˈʌvɚɹi ʌv tˈuː fˈiːmeɪlz ɪnðə sˌæn dʒˈoʊkwɪn ɹˈɪvɚ dʒˈʌst nɔːɹθwˈɛst ʌv fɹˈɛsnoʊ ɔnðə bˈoːɹdɚ bᵻtwˌiːn mˈædɚɹə ænd fɹˈɛsnoʊ kˈaʊntiz.
A second established population of the species in California is now suspected, following the March 2016 discovery of two females in the San Joaquin River just northwest of Fresno on the border between Madera and Fresno Counties.