The protoconid, metaconid
, hypoconid and entoconid are organized into two distinct lobes with rounded corners separated from each other by a well-developed median valley.
At the antero-lingual side the metaconid
is present having a thin and wrinkled enamel border.
Whereas M3 is a simple peglike tooth, m3 is slightly more complex, consisting of a reduced protoconid/ metaconid
The p4 has a strongly developed posterior cuspid, m1 with strong and voluminous metaconid
, m2 big with reduced to absent paraconid, narrow talonid almost completely occupied by the hypoconid.
The m1 has the labial and lingual cusps alignment alternate rather than opposite (as in the uppers), the metaconid
is anteriorly positioned with respect to the protoconid, and the entoconid is anteriorly positioned with respect to the hypoconid.
Number of Occurrences Percentage Tooth First molar (P) 58 62.4 Fourth premolar (D) 18 19.4 Second molar (P) 14 15.1 Second premolar (D) 6 6.5 Third molar (P) 5 5.4 Third premolar (D) 5 5.4 Cusp Hypoconid 77 55.4 Protoconid 26 18.7 Metaconid
18 12.9 Entoconid 17 12.2 DISCUSSION
The PCS fossils agree with Soricini because the articular facets of the condyle are continuous, and m1-m2 each retain an entoconid crest that joins the entoconid to the metaconid
The ml (MBLUZ-P-3.990, MBLUZ-P-5.896, MBLUZ-P-4.690; Table I; Figure 2f) has an anteriorly projected paraconid without enamel band; a metaconid
enamel band is present; meta-entoconid fold shallow and reflected 45[degrees] anteromesialy; ento-hypoconid fold deeper and less inclined (85[degrees]) anteromesialy than meta-entoconid fold; hypoconid buccolingually broad, looks like a trigonid size; anterior facet of the trigonid convex; the lingual enamel band extends to the metaconid
to the anterolingual side of the hypoconid, without covering it totally; buccal enamel fold deeper; buccal enamel band covering the anteromesial protoconid facet through posteromesial hypoconulid facet; hypoconid lingually projected; buccal enamel broader than lingual enamel.
Ankylodon is characterized by having moderate curvature of the trigonid, reduced paraconid, strongly convex buccal margin of the protoconid and metaconid
, and boarder nature of the tooth when compared to Metacodon (1) all of which are seen in PTRM 1600.
extend forwards meeting the base of the paraconid.
Differs from Anthracokeryx, North American Bothriodon, Aepinacodon and Arretotherium, and Euro-American Elomeryx and African Bothriogenys in possessing a strong postprotocristid, tooth rows without significant diastemata between canine and P/1 and/or P/1-P/2, relatively simple P/2-P/3 with posterior cingulid slight, P/4 only slightly elaborated by a strong protocristid and lacking posterior cingulid, premolar lingual cingula absent, molar paracristid ending near base of metaconid
and unconnected to anterior cingulum, and molar postentocristid weak ( H.