ɐnˈʌðɚ stˈʌdi pɹəpˈoʊzᵻz ɡlˈɪptəstɚnˌɔɪdz pˈɑːsᵻbli ɚɹˈɪdʒᵻnˌeɪɾᵻd ɪnðɪ ˈɑːlɪɡˌoʊsiːnmɪˈoʊsiːn bˈaʊndɚɹi nˈaɪntiːn twˈɛnti fˈoːɹ ˌɛmwˌaɪˈeɪ ænd ɹˈeɪdɪˌeɪɾᵻd fɹʌmðə mɪˈoʊsiːn tə plˈɛstoʊsˌiːn ɐlˈɔŋ wɪð sˈɛvɹəl ɹˈæpɪd spˌiːʃɪˈeɪʃən ᵻvˈɛnts ɪn ɐ ɹˈɛlətˌɪvli ʃˈɔːɹt tˈaɪm.
Another study proposes glyptosternoids possibly originated in the Oligocene-Miocene boundary (19–24 Mya) and radiated from the Miocene to Pleistocene along with several rapid speciation events in a relatively short time.