. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. DENTITION AND TOOTH REPLACEMENT IN TWO BAURLAMORPH REPTILES 235 The crown is unworn and in contrast to the 15th is terminated by four small cusps. The second cusp from the anterior border is the largest. Their apices do not lie in the same plane but are arranged to form an arc. A wide gap separates the 12th and 14th teeth. The functional tooth appears to have been lost, although this could not be confirmed beyond doubt. A pit in the base of the longitudinal groove containing a replacing tooth (fig. 2
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. DENTITION AND TOOTH REPLACEMENT IN TWO BAURLAMORPH REPTILES 235 The crown is unworn and in contrast to the 15th is terminated by four small cusps. The second cusp from the anterior border is the largest. Their apices do not lie in the same plane but are arranged to form an arc. A wide gap separates the 12th and 14th teeth. The functional tooth appears to have been lost, although this could not be confirmed beyond doubt. A pit in the base of the longitudinal groove containing a replacing tooth (fig. 2 A, rep. t. 13) is n. B tab. Fig. 2.—Ericiolacerta parva. A, medial view of posterior portion of the left upper and lower dentitions, and B, posterior view of 14th and 10th teeth. Both x 10. (Key to lettering, p. 225.) present lingual to this gap. It has been interpreted as a replacing tooth for the 13th. The 12th tooth is partially erupted (stage I). The accessory cusps have been lost as a result of damage but there is no sign of wear on the remaining central cusp. The nth is fairly tightly held (stage II) and the longitudinal groove is present lingual to its base. An oblique wear facet sloping inwards and downwards has obliterated all trace of the anterior accessory cusps. The 10th is tightly held and a large pit is present lingual to it in the base of the longitudinal groove (stage III). The matrix was not completely removed from this pit and it presumably contained a replacing tooth in life. The crown is considerably worn and two distinct facets can be identified (fig. 2 B 10): a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
Size: 2232px × 1120px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
