Ptolemaiidae Osborn, 1908

Kampouridis, Panagiotis, Hartung, Josephina, Augustin, Felix J., Atfy, Haytham El & Ferreira, Gabriel S., 2023, Dental eruption and adult dentition of the enigmatic ptolemaiid Qarunavus meyeri from the Oligocene of the Fayum Depression (Egypt) revealed by micro-computed tomography clarifies its phylogenetic position, Zoological Journal of the Linnean Society 199 (4), pp. 1078-1091 : 1080

Family Ptolemaiidae Osborn, 1908

Amended diagnosis: The family Ptolemaiidae is a group of Ptolemaiida with the following characteristics: metaconule present on P4; upper molars mesiodistally short and without mesial and distal cingula; bases of paracone and metacone fused on upper molars; postprotocrista of M1 and M2 do not meet with the metacone; large hypoconid is present in p4; mesiodistally short talonid basins on lower molars m1–m3; m3 paraconid closely situated to metaconid; molariform teeth decrease in length from p4 to m3 (modified asser Cote et al. 2007, Gunnell et al. 2010).