New materials of the Early Cretaceous spinosaurid (Theropoda) teeth of Napai Basin, Fusui County, Guangxi
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摘要:
广西扶绥县那派盆地早白垩世新隆组中产有以蜥脚类、兽脚类、禽龙类等恐龙为代表并包含弓鲛类、辐鳍鱼类、龟鳖类、鳄形类的脊椎动物群, 其与泰国东北地区Khorat群Khok Kruat组(阿普特阶)脊椎动物群面貌相近。最新发现于那派盆地的棘龙类牙齿化石新材料, 其齿冠横断面为宽略小于长的亚圆形, 齿冠前后缘无小锯齿, 齿冠表面具明显纵嵴和纵沟, 单侧面纵嵴数目12~15条。这些形态表明, 那派盆地的棘龙类牙齿可归入棘龙亚科(Spinosaurinae), 且与泰国东北地区Khok Kruat组棘龙类牙齿的形态类型Ⅱ(Siamosaurus形态类型)可对比。新发现的牙齿化石还显示, 那派盆地目前仅存在一种类型的棘龙类, 其可能与泰国的暹罗龙(Siamosaurus)关系较密切。
Abstract:The late Early Cretaceous vertebrate fauna from the Napai Basin in Fusui County (southwestern Guangxi)is featured mainly by sauropod, theropod, iguanodontian dinosaurs, with other clades such as hybodont sharks, actinopterygians, turtles and crocodiles.This vertebrate fauna shows the close relationships to that of the Khok Kruat Formation in northeastern Thailand, both to be considered as Aptian in age. The newly discovered spinosaurid teeth from the Napai Basin possess such characters: tooth crown sub-circular in cross-section, denticles on carinae absent, longitudinal ridges and flutes distinct with the ridge numbers on each side about 12 to 15. These teeth can be further included within the subfamily Spinosaurinae.Only one morphotype of the spinosaurid teeth is identified from the Napai Basin, which falls within the range of Morphotype Ⅱ (Siamosaurus morphotype) of spinosaurid teeth from the Khok Kruat Formation in northeastern Thailand. The similar spinosaurid teeth most probably suggest their closer affinity of spinosaurids between the Napai Basin in Guangxi and the northeastern Thailand during the late Early Cretaceous.
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Key words:
- Spinosaurinae /
- teeth /
- Lower Cretaceous /
- Napai Basin /
- Guangxi
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表 1 广西扶绥棘龙类牙齿标本测量
Table 1. Measurements of spinosaurid teeth specimens from Fusui County, Guangxi
标本编号 CBL
/mmCBW
/mmCBR AL
/mmCH
/mmCHR 齿冠单侧纵嵴数目/条 FS-20-069 - - - - - - 14 FS-20-074 9.3 - - 38.0 36.0 3.87 14 FS-20-106 - - - - - - 13~14 FS-20-111 12.0 - - 33.2(e) 31.9(e) 2.66(e) 15 FS-20-115 16.8 - - - - - 14 FS-20-116 - - - - - - 13~14 FS-20-120 14.9 - - 68.3(e) 67.0(e) 4.50(e) 14~15 FS-20-122 8.5 - - 34.0 31.4 3.69 12~13 FS-20-134 10.8 8.0(e) 0.74(e) 39.2 36.4 3.37 14~15 注：AL—齿冠长度; CBL—齿冠基部长度; CBR—齿冠基部比率; CBW—齿冠基部宽度; CH—齿冠高度; CHR—齿冠高度比率; (e)—估计值; “-”—未定值 
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