NOTES ON ROSTRAL TEETH OF GANOPRISTINE SAWFISHES, WITH SPECIAL REFERENCE TO TEXAS MATERIAL
NOTES ON ROSTRAL TEETH OF GANOPRISTINE SAWFISHES, WITH SPECIAL REFERENCE TO TEXAS MATERIAL
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关于甘诺普里斯坦锯鱼喙牙的注释，特别参考德克萨斯州的材料
DOI：
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发表时间：
1968
期刊：
影响因子：
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通讯作者：
M. Steiner
中科院分区：
文献类型：
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作者：
B. Slaughter;M. Steiner
对墨西哥湾沿岸平原的海洋沉积物进行了大量的洗涤，这些沉积物的年龄从阿尔比安到蒙蒂安不等，结果发现了三属加诺普汀锯鳐的吻齿。样本中含有硬齿猴的牙齿，这一属以前从未在美洲报道过。这些藏品被认为证明了两个属内的进化；来自Albian沉积物的Onchopristis dunklei牙齿的后缘倒刺比来自德克萨斯州Cenomanian沉积物的相同牙齿的后缘倒刺少。(2)从土尔东期到三东期，大根牙的牙髓腔明显增大，牙基的牙本质数量减少。某些物种的地质范围不重叠，可能被证明在分区中是有用的。
Bulk washing of marine sediments of the Gulf Coastal Plain, varying in age from Albian to Montian, has resulted in the recovery of rostral teeth of three genera of ganopristine sawfishes. The sample contains teeth of Sclerorhyncus, a genus not before reported from America. The collection is believed to demonstrate evolution within two genera; (1) teeth referred to Onchopristis dunklei from Albian deposits have fewer barbs along their posterior edge than otherwise identical teeth from Cenomanian deposits of Texas. (2) There is a gross enlarge- ment of the pulp cavity and decrease in the amount of osteodentine in the bases of Ischy- rhiza mira teeth from Turonian to Santonian. Certain species have geologic ranges which do not overlap and may prove to be useful in zonation.