The third suborder, Sirenoidea, contains the four species of sirens, which are in a single family, Sirenidae.
ðə θˈɜːd sˈʌboːɹdɚ, sˈaɪɚnɔɪdˌiə, kəntˈeɪnz ðə fˈoːɹ spˈiːsiːz ʌv sˈaɪɹənz, wˌɪtʃ ɑːɹ ɪn ɐ sˈɪŋɡəl fˈæmɪli, sˈaɪɚnɪdˌiː.