Description
Original diagnose after Steurbaut & Herman (1978) p. 305 [2285] and emended diagnose after Reinecke et al. (2020) p. 104 [29177]: Steurbaut & Herman (1978: p. 305) gave the following diagnosis based on one tooth (Fig. 23A1–5; RBINS P2643) from the Terhagen Member (level S33) of the Boom Formation (translated from French, with a few amendments of dimensions and descriptive terms; Fig. 1): “The oral tooth in question is slightly asymmetric and possesses a relatively compact main cusp which is weakly curved lingually. Its dimensions are: 1.3 mm width, 1 mm height, and ca 0.8 mm thickness. The crown is completely smooth, its axial lingual protuberance [= uvula] distinct, and the apron rounded and slightly bilobed. The root, trilobed by the lingual protuberance, shows an axial labial depression and a root structure characteristic of hemiaulacorhize vascularization. Two small foramina are observed at the base of the labial depression. On the lingual root face, a main foramen and several smaller foramina, placed laterally, are noticed. The main foramen is slightly displaced (decentral) from the axis of the uvula. The basal root surface is completely flat.”
The preceding description mainly characterises pristiophorid teeth at the genus level. We add a few more specific attributes for distinction of Pr. rupeliensis at the species level, based on the material examined: medium-sized pristiophorid teeth, up to 1.7 mm wide and 1.3 mm high. Dental pattern gradientmonognathic heterodont and probably dignathic heterodont. Labial crown face of most teeth only slightly enlarged in labial direction; heels moderately wide, subhorizontal near the cusp and steeply declining near the crown margins. Axial fold on labial crown face absent. Labial visor never smooth but variably strongly ornamented, often covered with distinctive folds stretching to the labial crown face (except in posterior teeth). Apron commonly broad, wellrounded (apico-basally) and unilobed or bilobed. With rare exceptions, cutting edges continuous from near the apex to the lateral crown margins, sometimes bifurcate on outer heels. Cusplets or low humps on heels very rare in anterior and lateroposterior teeth. Uvula long and rectangular to mesio-distal tooth axis in anterolateral teeth, but shorter and sometimes oblique in lateroposterior teeth (as seen in occlusal view). Laterolingual crown faces commonly smooth, more rarely with a transverse crest or subvertical folds. Root anaulacorhize (not: hemiaulacorhize, as in original diagnosis) and lower than crown (in profile view), except for teeth from posteriormost files. Axial labial depression of root distinct, typically with up to three larger foramina near the root base.

Remarks
shark-references Species-ID=14295;

References