metacone


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metacone

[′med·ə‚kōn]
(vertebrate zoology)
The posterior of three cusps of primitive upper molars.
The posteroexternal cusp of an upper molar in higher vertebrates, especially mammals.
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References in periodicals archive ?
The M2 lacks a talon and hypocone, and the postprotocrista runs from the protocone to the base of the metacone.
In general, the P4 of amphicyonids is laterally compressed and the protocone is nearly in line with the paracone and metacone as exhibited by SDSM 82105.
The transverse ridge posterior to the metacone is well developed as in Recent S.
The paracone and metacone are subequal in size with metacone positioned slightly toward the midline (linguad).
Based on wear patterns involving the protocone and metacone on the M1 and M2, but taking into account also wear on P3, P4, and M3, we finally established three categories: 1) young adults (yearlings)--slight to moderate wear on labial cones of M1 and M2 but cones well formed and discrete, and P3 and M3 showing little wear; 2) adults--labial cones still evident but with heavy wear, P4 and M3 worn and P3 showing some wear; 3) old adults--labial cones almost completely worn away in terms of recognition, all cheekteeth flattened or nearly so with wear.