Between this cusp and the metaconid behind it, the central basin of the trigonid is open towards the lingual margin of the tooth.
12.
They cited the retention of a distal metacristid and an " open " trigonid as characters separating " Ambondro " from more modern tribosphenidans.
13.
The p4, represented by YGSP 24338, is an elongate, two-rooted tooth with a distinct trigonid at the front and talonid at the back.
14.
It has a more closed trigonid ( with the protolophid and metalophid making a more acute angle ), the protolophid is shorter, and the paraconid is indistinct.
15.
The trigonid and talonid are about as broad, the trigonid is low-crowned, and wear is mainly horizontal, resulting in broad, flat exposed wear facets.
16.
The trigonid and talonid are about as broad, the trigonid is low-crowned, and wear is mainly horizontal, resulting in broad, flat exposed wear facets.
17.
Three reentrant folds present on trigonid of P 3 : an anterior reentrant fold, an anterointernal reentrant fold ( rarely cut off to form an enamel lake ), and an anteroexternal fold.
18.
The distinguishing features of " Pelycodus " from " Cantius " are its anteroposteriorly compressed trigonid, its small paraconid on M 2 and lack of hypoconulid on M 1-2.
19.
They characterized Australosphenida by the shared presence of a cingulum on the outer front corner of the lower molars, a short and broad talonid, a relatively low trigonid, and a triangulated last lower premolar.
20.
Australosphenida is characterized by the shared presence of a cingulum on the outer front corner of the lower molars, a short and broad talonid, a relatively low trigonid, and a triangulated last lower premolar.
