pɹˈiːviəsli, ðə mˈɛθəd ʌv jˈuːzɪŋ spəsˈɪfɪk ɚɹˈeɪndʒmənts ʌvðə lˈæɾɚɹəl lˈaɪn sˈɛnsɚɹi kənˈælz tʊ aɪdˈɛntᵻfˌaɪ ðə wˈɛl kˈæɹɪktɚɹˌaɪzd sˈaɪɐθˌæspɪdˌɪd ænd tˈɛɹɐspˌɪdɪd spˈiːsiːz wɜːɹ ɐplˈaɪd tə sˈæmoʊstˌeɪdz, bˌʌt pɹˈuːvd nˌɑːt təbi jˈuːsfəl.
Previously, the method of using specific arrangements of the lateral line sensory canals to identify the well characterized cyathaspidid and pteraspidid species were applied to Psammosteids, but proved not to be useful.