Like "Acutiramus", "Pterygotus" lived in fully marine environments, and its fossils are today recovered associated with common and diverse fossils indicative of such an environment. Notably, "P. barrandei" and "P. cobbi" occur in marine environments associated with fossils of "Acutiramus". "Pterygotus" was more widespread than "Acutiramus" and as such many species occur without associated representatives of "Acutiramus" as well, such as the British "P. lightbodyi". The living environment of "P. australis", also marine, was in particularly deep water. The only known fossil organisms of the same age and place as "P. australis" are crinoids of the genus "Dendrocrinus" and "Kooptoonocrinus" and ophiouroids of the genus "Protaster".