euryodon of a parastyle in the P4, starting from the union of the anterior crista of the paracone
with the cingulum (NAP XV 76'08).
M3 occlusal surface: 0 = cuspate with a distinct paracone
, protocone, and hypocone; 1 = lophate with 3 lophs; 2 = lophate with 2 lophs.
Figure 1 shows in detail the presence of this trait described from the disto-sagittal crest in the paracone
of the upper first premolar.
4 mm ocular reticle on the paracone
of the second molar.
1991) found that the paracone
method was slightly better than centroid methods for predicting tree bole volumes.
Most Cretaceous marsupials are diagnosed on the basis of upper molar morphology; the paracone
Ectoloph is convex and has a paracone
fold along the entire height of the tooth.
To determine cusp relief, we measured the depth of the valley between the paracone
and metacone cusps as well as the anteroposterior length of each tooth using the computer software ImageJ 1.
The protocone and paracone
are equivalent in size, and separated from the hypocone-metacone complex by a deep valley.
is on the anterior margin of the tooth and is larger than the metacone, which is on the posterior margin.
Using these criteria, four age groups were identified, which were suspected to represent annual cohorts characterized as follows: 1) young adults--slight to moderate wear on paracone
and metacone of P4, M1, and M2, but protocone only slightly worn, P3 with virtually no (or only slight) wear; 2) adults--distinct wear on cones of P4 and all molars but individual cones clearly separated from each other except on M3 (wear had obliterated divisions between some cones and styles), P3 moderately worn; 3) adults--cones no longer distinct on molars, some cone integrity remains on P4, top occlusal surface of P3 nearly flattened; 4) old adults--P3 appearing as a flattened peg, P4-M3 heavily worn, cones distinct (if present) only on labial margin of teeth.
is almost equal to the metacone in antero-posterior length.