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Epirigenys
Taxonomy
Epirigenys was named by Lihoreau et al. (2015). Its type is Epirigenys lokonensis.
It was assigned to Hippopotamoidea by Lihoreau et al. (2015); and to Anthracotheriidae by Scherler et al. (2019).
It was assigned to Hippopotamoidea by Lihoreau et al. (2015); and to Anthracotheriidae by Scherler et al. (2019).
Species
E. lokonensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Epirigenys Lihoreau et al. p. 2 fig. 1 |
| 2019 | Epirigenys Scherler et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Lihoreau et al. 2015 | Medium-sized bothriodontine. The following characters are unique within bothriodontines, differing notably from those of Bothriogenys, and shared with Hippopotamidae: developed cingular structures including high cingulid on labial side of P/3, presence of cingulid lingual to entostylid and high distal cingulid on P/4, high lingual cingulum on upper molars; strong and complex lower premolars with hypoconid on P/4, biconvex occlusal shape of premolars, developed post- and endoprotofossids, a short endoprotocristid; P4/ with mesial and distal accessory cusps; bunodont molars with rounded cusps, inflated crests (for example, prehypocristid in transverse valley of lower molars) and shallow valleys; presence of an entostylid on lower molars, and a groove separating preparacrista and parastyle. Enamel microstructure similar to that of Kenyapotamus, except for lacking inter-row sheet in inner part. Features shared with Bothriogenys but that are unknown in Hippo- potamidae include the lack of an ectoprotofossid on P/4, the postmetacristid not orientated towards the centre of the tooth and the position of the distostylid on lower molars, mesio-distal ribs of labial cusps of upper molars less devel- oped, the presence of two distal well-developed cristae on the protocone, the divided premetacristule, the lack of post- metafossule and the developed parastyle and mesostyle. |