 Unknown to her at the time, Carpenter (1996) had revised the Polycotylidae and separated "Dolichorhynchops" from "Trinacromerum", raising the question as to whether or not the specimens represented a separate species or just larger individuals of "D. osborni".A study in 2008 found that "T. bonneri" is a valid species of "Dolichorhynchops", "D. bonneri".Main article