metaconule

met·a·con·ule

(met'ă-kon'ūl),
The distal intermediate cusp of an upper molar tooth.
[meta- + G. kōnos, a cone]

metaconule

(mĕt-ă-kŏn′ūl)
The distal intermediate cusp of an upper molar tooth.
References in periodicals archive ?
1 (basalmost artiodactyls [paraphyletic]: diacodexid, primitive [unassigned, some dichobunine] dichobunid dichobunoids): Ml-3 (Ms) bunodont, triangular; metaconule unenlarged; no hypocone (Old World [OW] origin).
2 (some more-derived dichobunines plus lantianiine, some eurodexine dichobunids): Ms quadrate, incipiently selenodont; hypocone distinct; metaconule in latter two groups still connected to protocone by postprotocrista, interrupting transverse valley (TV) (OW).
3 (most-derived dichobunoids [dichobunine Dichobune, hyperdichobunine dichobunids; might include other dichobunids with quadrate hypoconiferous Ms] plus caenotheriids); Ms relatively selenodont, quadrate; tritubercular distal lobe with distinct metacone, metaconule, and hypocone; TV continuous; paraconule reduced/lost (OW).
dacrytheriids], mixtotheriids, dichodontids, xiphodontids, amphimerycids, maybe some dichobunines): Ms primitively bunodont, quadrate, each with bitubercular distal lobe bearing enlarged metaconule as distolingual cusp.
The lack of the paraconule and metaconule suggest a primitive morphology and support the assignment to the Hesperocyoninae.
The metaconule is pyramidal in shape with a moderately developed preme tacrista that is mesiolingually directed to join the slight lingual cingulum between protocone and metaconule.
The tooth can be described as follows: ectoloph is typically W-shaped; hypocone is absent but a postprotocrista extends posteriad from the metaconule as a curved sloping ridge with a small talon formed by its base.