Table 6. Ocepeia daouiensis, main derived features of the skull and lower jaw (* anthropoid-like feature).
| Feature description | Taxonomic rank | K # in matrix |
| Petrosal: Fenestra vestibuli elliptical with high stapedial ratio | Placentalia | 164–1 |
| Petrosal, inner ear: Secondary bony spiral lamina present on the basal turn | Placentalia, some primitive eutherians | 174–1 |
| Petrosal, inner ear: Number of turns of the cochlea ≥2 | Placentalia | 175–2 |
| Petrosal, inner ear: Large angle of spiral plan of cochlea and horizontal plan | ?Placentalia | - |
| Petrosal: Fenestra cochlea oriented posteriorly | ?Placentalia | - |
| Petrosal, inner ear: No secondary crus commune | Placentalia | - |
| Petrosal, inner ear: Crus commune moderately long | Placentalia | - |
| Small coronoid fossa present | Paenungulata | 63–1 |
| Wide nasal cavity | ?Paenungulata | 126–1 |
| Very short maxillary process developed in the orbit rim (short bony blade between lacrimal and jugal) | Paenungulata | 136–1 |
| Jugal high with small but distinct postorbital ventral process at maxillary suture | ?Paenungulata | 145–1 |
| Amastoidy | Paenungulata | 161–1 |
| Zygomatic process of the maxilla well-developed laterally, extended caudally on the medial part of the jugal | Paenungulata | - |
| Caudal process of the petrosal large and inflated | Paenungulata | - |
| Glenoid surface of the squamosal poorly excavated, wider than long, and opened anteriorly | Paenungulata or Afrotheria | - |
| Enlarged (long) pars mastoidea | Proboscidea or autapomorphy | 162–1 |
| Lower jaw: Mandibular symphysis probably fused | Autapomorphy* | 52–1 |
| Lower jaw: condyle significantly higher than the tooth row | Autapomorphy | 59–1 |
| Extensive pneumatization of the skull bones | Autapomorphy | 118–2 |
| Short and wide rostrum (premaxilla, maxilla, nasal) | Autapomorphy* | 120–3 |
| Short frontal, with reduced orbito-temporal process | Autapomorphy | 141–1 |
| Meso- and postero-cranial region elongated, including parietal, alisphenoid, pterygoid, basisphenoid, periotic (pars mastoidea) | Autapomorphy | - |
| Parietals with two oblique bony ridges diverging anteriorly from the mid part of the sagittal crest | Autapomorphy | - |
| Lower jaw: corpus inflated | Autapomorphy | - |
| Lower jaw: broad and round posteriorly projecting angular process | ? (“ungulates”) | 62–1 |
| Fenestra vestibuli very small | ? | 163–1 |
| Tegmen tympani hyper-inflated and pneumatized, forming large and robust barrel-like bony structure | ? | 169–1 |
| Sulcus for the internal carotid artery on promontorium | ? | - |
| Jugular foramen large | ? | 170–1 |
| No postorbital process of the frontal | ? | 148–1 |
| Lower jaw: condyle with two articular facets | ? | - |
Numbers refer to those of the matrix analyzed in this work (see Text S1, part II).