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.
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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.
The valley in front of the trigonid is small and is bordered anteriorly by a subtle cingulum.
690; Table I; Figure 2f) has an anteriorly projected paraconid without enamel band; a metaconid enamel band is present; meta-entoconid fold shallow and reflected 45[degrees] anteromesialy; ento-hypoconid fold deeper and less inclined (85[degrees]) anteromesialy than meta-entoconid fold; hypoconid buccolingually broad, looks like a trigonid size; anterior facet of the trigonid convex; the lingual enamel band extends to the metaconid to the anterolingual side of the hypoconid, without covering it totally; buccal enamel fold deeper; buccal enamel band covering the anteromesial protoconid facet through posteromesial hypoconulid facet; hypoconid lingually projected; buccal enamel broader than lingual enamel.
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.
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.
The m1 lacking a metaconid or with a residual metaconid; tendency toward shortening of the talonid and elongation of the trigonid.
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.