trigonid


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Related to trigonid: lophodont

tri·gon·id

(trī-gon'id, -gō'nid),
The first three dominant cusps, taken collectively, of a lower molar tooth.
See also: trigone.

tri·gon·id

(trī'gŏ-nid)
The first three dominant cusps, taken collectively, of a lower molar tooth.
See also: trigone

trigonid

(trī-gō′nĭd)
The first three cusps of a lower molar tooth.

tri·gon·id

(trī-gon'id)
First three dominant cusps of a lower molar tooth.
References in periodicals archive ?
Among the fossils he studied were a m2 from Napak I (NAP-1), close in dimensions and morphology to NAP XV 162'08, the two molars lacking a paraconid, the trigonid valley being high and small, and the talonid narrower than the trigonid.
Description: The alveolar border of the teeth in the mandible (MBLUZ-P-3990, Figure 2f) is parallel with the inferior margin of the horizontal mandibular ramus; there is a relatively large mentonian foramen under the alveolus for the trigonid of mi, which extends anteriorly to the posterior part of the p4 talonid.
Additionally, a third distinct species exists in manuscript form and can be differentiated by smaller size and a wider talonid than trigonid on the m1 (7).
Canis nehringi has an enlarged ml as on TERA-154, but lacks accessory cuspids on the posterior margin of the trigonid as on the specimen from Terapa.
m1: (L: 1.44; TRW: 0.77; TLW: 0.91): The talonid is wider than the trigonid. The hypolophid is well developed and does not reach the entoconid.
geismarianus is characterized by an m I with a low, short trigonid with the metaconid slightly more posterior than the protoconid, a large talonid, subequal entoconid and hypoconid, compressed m2 trigonid with an anterobuccal cingulid, and a very small paraconid SDSM 8640 differs from N geismarianus in that the length of the ml is not as reduced and has a lesser degree of trigonid compression on the m2.
lusitanica differ from those of the other species of the genus in the smaller paraconid and a shorter trigonid when compared to the talonid.
A deep median valley of the trigonid and the talonid and well developed hypoconulid development are the characteristic features of the studied specimens.
The talonid is slightly larger in length than the trigonid. The stylids are not very bulbous.
The m1 lacking a metaconid or with a residual metaconid; tendency toward shortening of the talonid and elongation of the trigonid. P3 with or without an internal root.
The paralophid is short; the trigonid is V-shaped and the posterior valley is U-shaped; the labial cingulum is absent; the hypolophid reclines backwardly; the entoconid is lingually flat; the talonid is better developed than the trigonid; the labial groove is shallow and U-shaped in both premolar and molars.