æz ɐ ɹɪzˈʌlt, ðɛɹ ɪz sˌʌm dˌɪsɐɡɹˈiːmənt ˌoʊvɚ ðə nˈʌmbɚɹ ʌv spˈiːsiːz, wɪð mˈɑːdɚn sˈoːɹsᵻz ɡˈɪvɪŋ bᵻtwˌiːn twˈɛnti ˈeɪt ænd θˈɜːɾi θɹˈiː spˈiːsiːz.
As a result, there is some disagreement over the number of species, with modern sources giving between 28 and 33 species.