ðə nˈʌmbɚɹ ʌv spˈiːsiːz ɪz ʌnnˈoʊn æz ʌv tˈuː θˈaʊzənd twˈɛnti wˈʌn ðɛɹˌɑːɹ fˈoːɹɾi ˈeɪt spˈiːsiːz ɪn sˈɛvən dʒˈɛnɚɹə, bˌʌt mˈoːɹ spˈiːsiːz ɑːɹ bˌiːɪŋ stˈʌdid.
The number of species is unknown – as of 2021 there are 48 species in 7 genera, but more species are being studied.