球齿龙（Globidens）又称圆齿龙，意为“球状牙齿”，是沧龙科的一个属，模式种为 阿拉巴马球齿龙 (Globidens alabamaensis)。
球齿龙属 化石时期：
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|---|---|
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| 阿拉巴马球齿龙 | |
无效状况
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科学分类 
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| 界： | 动物界 Animalia |
| 门： | 脊索动物门 Chordata |
| 纲： | 爬行纲 Reptilia |
| 目： | 有鳞目 Squamata |
| 总科： | †沧龙总科 Mosasauroidea |
| 科： | †沧龙科 Mosasauridae |
| 亚科： | †沧龙亚科 Mosasaurinae |
| 属： | †球齿龙属 Globidens Gilmore, 1912 |
| 种 | |
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球齿龙是属于中型的沧龙类，身长为6米，拥有流线型的身体、扁平的尾部与强而有力的下颌。球齿龙的牙齿与其他沧龙类非常不同，大部分的沧龙类都具有尖锐的牙齿用来撕裂猎物，适合猎捕鱼类或其他海洋爬行动物如别种中小型沧龙类及蛇颈龙类等。虽然有些沧龙类也偶尔会去捕食带硬壳的软体动物，不过球齿龙更特殊，牠们拥有半球状特化的牙齿，更适合压碎海龟、菊石类、鹦鹉螺与贝类等防御力高动物的外壳。就像沧龙一样，球齿龙拥有密切接合的下颌与坚硬的头部，这些特征无疑是非常适合去咬破软体动物的硬壳。
体型较小的Carinodens，被认为是圆齿龙的姐妹分类单元。
参考资料
- Bardet, N., Pereda Suberbiola, X., Iarochène, M., Amalik M., and Bouya, B. 2005. Durophagous Mosasauridae (Squamata) from the Upper Cretaceous phosphates of Morocco, with description of a new species of Globidens. Netherlands Journal of Geosciences / Geologie en Mijnbouw, 84(3), p. 167-176.
- Everhart, M.J. 2008. Rare occurrence of a Globidens sp. (Reptilia; Mosasauridae) dentary in the Sharon Springs Member of the Pierre Shale (Middle Campanian) of Western Kansas. p. 23-29 in Farley G. H. and Choate, J.R. (eds.), Unlocking the Unknown; Papers Honoring Dr. Richard Zakrzewski, , Fort Hays Studies, Special Issue No. 2, 153 p., Fort Hays State University, Hays, KS.
- Gilmore, Charles W. 1912. A new mosasauroid reptile from the Cretaceous of Alabama, Proceedings U.S. National Museum, 40(1870): 489-484, 3 fig., pl. 39-40 (Description of Globidens alabamaensis type)
- Huene, E. von. 1935. Mosasaurier-Zähne von Timor. Centralblatt fur Mineralogie. Geologic und Palaeontologie; in Verbindung mit dens Neuen Jahrbuch fur Mineralogie, Geologie und Palaeontologie. Stuttgart. Abt. B 10 412-416, 3 figs. (in German)
- Martin, J. E. 2007. A new species of the durophagous mosasaur, Globidens (Squamata: Mosasauridae) from the Late Cretaceous Pierre Shale Group of central South Dakota, USA. Pages 167-176 in Martin, J. E. and Parris D. C. (eds.), The Geology and Paleontology of the Late Cretaceous Marine Deposits of the Dakotas. Geological Society of America, Special Paper 427. (Globidens schurmanni)
- Russell, Dale A. 1975. A new species of Globidens from South Dakota. Fieldiana Geology, 33(13): 235-256. (Field Museum of Natural History)
- Zdansky, O. 1935. The occurrence of mosasaurs in Egypt and in Africa in general. Bulletin de l’Institut d’Egypte 17: 83-94.
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