The entoconid cusp, located lingually, is relatively high and is separated from the mesolophid before it by a deep valley.
12.
At the back of the tooth, the entoconid cusp is connected to the posterolophid, a crest that forms the back margin.
13.
The talonid contains a hypoconid, hypoconulid, and entoconid and is much wider than the trigonid because the hypoconid is displaced buccally.
14.
The second molar is about square and shows the four main cusps commonly present in rodents : the protoconid, metaconid, hypoconid, and entoconid.
15.
In " I . kamlialensis ", the entoconid is distinct from the hypoconulid, which is large, but the tooth is otherwise similar.
16.
A crest, the postcristid, descends from the hypoconid along the back margin of the tooth and almost reaches the entoconid, which is separated by a notch.
17.
They are named after their locations, e . g . a paraconule is located between a paracone and a metacone, a hypoconulid is located between a hypoconid and an entoconid.
18.
Although a crest, the postmetacristid, descends from the back side of the metaconid, ending in a small cusp, the metastylid, it is separated from the entoconid by a notch.
19.
Like the upper teeth, they bear four cusps ( metaconid, protoconid, entoconid, and hypoconid ), four lophs ( metalophid, mesolophid, hypolophid, and posterolophid ) and three valleys.
20.
The main cusps, the buccal hypoconid and lingual entoconid, are opposite each other on the margins of the tooth ( the entoconid is further to the front in " Phenacopithecus " ).
