The
metacone is united with a metaconule at the posterior end, through a narrow channel.
The paracone and
metacone with their sloping cristae are well preserved.
The paracone is slightly taller than the
metacone, the protocone is large and displaced mesially.
The
metacone "lobule" is smaller than the paracone one.
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Metacone Part No - 42632000 .
The posterior walls of the protocone and the paracone show low posterior spurs that connect, at medium level, to the hypocone and the
metacone, respectively.
The protocone is on the anterior margin of the tooth and the
metacone is the largest cusp.
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.
The paracone is contiguous with
metacone through a narrow channel at the posterior side.
The ectoloph appears flat and the
metacone rib appears absent.
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Metacone Mounting Bracket L.
Remarks--The ectoloph of this tooth is strongly pigmented on the faces of the shearing blades below the postparacrista, premetacrista, and postmetacrista, but the pigment stops before reaching the base of the paracone and
metacone. It seems to represent a medium-sized shrew, much smaller than Megasorex and Blarina and about the size of Notiosorex crawfordi and Sorex trowbridgii.
