ɡlˈɪptəstɚnˌɔɪd kˈætfɪʃ spˈiːsiːz hæv ɹᵻstɹˈɪktᵻd dˌɪstɹɪbjˈuːʃənz, ænd mˈɛni ɐpˈæɹəntli wˈaɪdɹˈeɪndʒɪŋ spˈiːsiːz hɐvbɪn ʃˈoʊn tə kənsˈɪst ʌv mˈoːɹ ðɐn wˈʌn spˈiːsiːz, ˈiːtʃ wɪð ɹᵻstɹˈɪktᵻd dˌɪstɹɪbjˈuːʃənz.
Glyptosternoid catfish species have restricted distributions, and many apparently wide-ranging species have been shown to consist of more than one species, each with restricted distributions.