Sauropod teeth from the Upper Cretaceous Bissekty Formation of Uzbekistan
Sauropod teeth from the Upper Cretaceous Bissekty Formation of Uzbekistan
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DOI：
10.1080/08912963.2016.1229777
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发表时间：
2017-01-01
影响因子：
1.4
通讯作者：
Sues, Hans-Dieter
中科院分区：
文献类型：
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作者：
Averianov, Alexander;Sues, Hans-Dieter
来自乌兹别克斯坦Dzharakuduk上白垩统Bissekty组的泰坦龙类蜥脚类恐龙的孤立成年牙齿在整体结构上几乎没有差异，但在釉质雕刻和磨损模式上表现出相当大的变化。未磨损的幼年牙齿的牙冠形状从披针形到圆锥形不等。大多数标本的釉质质地类似于皱巴巴的纸或完全光滑的釉质。纵向沟槽沿着近中和远中边缘仅存在于少数牙冠上，并且可能在唇侧和舌侧上都发展。在252个磨损的牙冠中，有8种磨损模式，所有可能的组合为0-2个顶面和0-2个侧面磨损面。最常见的磨损模式为A1 L0（一个顶面，无侧面; 62.7%）。其次最常见的变异有两个顶面，没有侧面（A2 L0，12.3%）。这些根尖磨损小面包括由相对的功能性牙齿产生的主磨损小面，以及由替换的上牙齿在后期磨损阶段与功能性下牙齿接触而产生的次磨损小面。两个顶端磨损面的牙冠的相对丰度可能表明在Bissekty泰坦龙的牙齿电池的初期发展。
The isolated adult teeth of titanosaurian sauropods from the Upper Cretaceous Bissekty Formation at Dzharakuduk, Uzbekistan, differ little in overall structure but show considerable variation in enamel sculpturing and wear patterns. The crown shape of unworn juvenile teeth ranges from lanceolate to conical. Most specimens have enamel texture resembling crumpled paper or completely smooth enamel. Longitudinal grooves along the mesial and distal edges are present on only a few tooth crowns and might be developed on both the labial and lingual sides. Among 252 worn tooth crowns there are eight variants of wear patterns, all possible combinations of 0-2 apical and 0-2 lateral wear facets. The most common is wear pattern A1L0 (one apical facet, no lateral facets; 62.7%). The next most common variant has two apical and no lateral facets (A2L0, 12.3%). These apical wear facets include the primary wear facets, which are produced by an opposing functional tooth, and secondary wear facets, which are produced by a replacing upper tooth coming into contact with the functional lower tooth at a late wear stage. The relative abundance of tooth crowns with two apical wear facets possibly suggests incipient development of a tooth battery in the Bissekty titanosaur.