Figure 1.
Locality map of discovery site.
The star marked on the inset map denotes the location the selachian teeth were recovered from, approximately halfway between the eastern boundaries Lago Viedma and Lago Argentino (adapted from Mapa de la provincia de Santa Cruz, http://es.wikipedia.org/wiki/Archivo).
Figure 2.
Lamniform tooth in (A) lingual, (B) labial, and (C) lateral view. Note the slenderness of the principle cusp, the well-pronounced lingual protuberance lacking a nutrient groove, and the developed neck that maintains a constant width across all cusps. Scale bar equals 1 cm.
Figure 3.
Lamniform tooth in (A) lingual, and (B) labial view. Note distinct narrowing in the apical two-thirds of principle cusp. Scale bar equals 1 cm.
Figure 4.
Lamniform crown fragments in labial view.
(A) MPM-PV 3269, (B) MPM-PV 3270. Arrows point to longitudinal ridges (enameloid folding) at the base of the crown. Scale bar equals 1 cm.
Figure 5.
A selection of recovered tooth fragments showing size range and overall symmetry of crowns.
(A) MPM-PV 3271, (B) MPM-PV 3272, (C) MPM-PV 3267, (D) MPM-PV 3273, (E) MPM-PV 3274, (F) MPM-PV 3275. All fragments are in lingual view. Arrows point to small nutrient foramina. Note that in all specimens, the lingual neck maintains a relatively equal width across the base of the crown. Scale bar equals 1 cm.
Table 1.
Dental measurements for recovered tooth fragments.