Trilophosaurus phasmalophos was named by Kligman et al. (2020) [Trilophosaurus phasmalophos differs from all known trilophosaurids in possessing the following unique combination of characters and autapomorphies (marked with an asterisk): a crown base labiolingually wider than mesiodistally long (a 1:5 mesiodistal length to labiolingual width ratio) with two distinct cusps instead of three*; the tips of the cusps are slightly recurved lingually*; both cusps bear apicolingually-facing cingula on their mesial and distal margins, with two symmetrical cingula on the mesial and distal sides of the lingual cusp, one cingulum on the mesial margin of the labial cusp, and two superimposed cingula on the distal margin of the labial cusp, totaling five cingula per tooth*. Paratypes: PEFO 42231, PEFO 42261, PEFO 42271, PEFO 42117, PEFO 42278, PEFO 42167, PEFO 42292, PEFO 42209, isolated teeth Referred Material: DMNH PAL 2018-05-0012, DMNH PAL 2018-05-0013, isolated teeth.]. Its type specimen is PEFO 42082, a set of teeth, and it is a 3D body fossil.