Isolated tooth reveals hidden spinosaurid dinosaur diversity in the British Wealden Supergroup (Lower Cretaceous).
Isolated tooth reveals hidden spinosaurid dinosaur diversity in the British Wealden Supergroup (Lower Cretaceous).
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作者：
Barker CT;Naish D;Gostling NJ
孤立的棘龙科牙齿在英国英格兰南部的下白垩纪韦尔登超群中有相对较好的代表。直到最近，人们才认为这些牙齿可与模式种重爪龙（B. Walkeri），其标本来自萨里的Barremian Upper Weald Clay Formation。英国棘龙科的牙齿是从跨越大部分的C。Wealden超群25 Ma的沉积历史和最近的研究表明，英国棘龙科在分类上比以前认为的更加多样化。根据这两种观点，我们可以适当地怀疑上威尔德粘土组以外的孤立牙齿是否属于重爪龙的假设。在这里，我们使用系统发育，判别和聚类分析，以测试是否一个孤立的棘龙牙齿（HASMG G369a，由冠和部分根）从一个非威尔德粘土地层单位可以被称为重爪龙。HASMG G369a是在东苏塞克斯的一个不确定的下白垩纪地点发现的，但可能来自黑斯廷斯群的Valanginian暴露，也是英国已知最古老的棘龙类材料之一。棘龙科的亲缘关系在数量和质量上都得到了支持，HASMG G369a在任何分析中都没有与重爪龙相关联。这支持了最近重新解释的棘龙科的多样性在早白垩世的英国，这似乎是由多个棘龙谱系的方式可比的同时代伊比利亚存款。这项工作还回顾了英国和全球早期棘龙类的记录（主要是从牙齿标本中得知的），并重新审视了后森诺曼棘龙类持续存在的证据。
Isolated spinosaurid teeth are relatively well represented in the Lower Cretaceous Wealden Supergroup of southern England, UK. Until recently it was assumed that these teeth were referable to Baryonyx, the type species (B. walkeri) and specimen of which is from the Barremian Upper Weald Clay Formation of Surrey. British spinosaurid teeth are known from formations that span much of the c. 25 Ma depositional history of the Wealden Supergroup, and recent works suggest that British spinosaurids were more taxonomically diverse than previously thought. On the basis of both arguments, it is appropriate to doubt the hypothesis that isolated teeth from outside the Upper Weald Clay Formation are referable to Baryonyx. Here, we use phylogenetic, discriminant and cluster analyses to test whether an isolated spinosaurid tooth (HASMG G369a, consisting of a crown and part of the root) from a non-Weald Clay Formation unit can be referred to Baryonyx. HASMG G369a was recovered from an uncertain Lower Cretaceous locality in East Sussex but is probably from a Valanginian exposure of the Hastings Group and among the oldest spinosaurid material known from the UK. Spinosaurid affinities are both quantitatively and qualitatively supported, and HASMG G369a does not associate with Baryonyx in any analysis. This supports recent reinterpretations of the diversity of spinosaurid in the Early Cretaceous of Britain, which appears to have been populated by multiple spinosaurid lineages in a manner comparable to coeval Iberian deposits. This work also reviews the British and global records of early spinosaurids (known mainly from dental specimens), and revisits evidence for post-Cenomanian spinosaurid persistence.
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影响因子：
2.7
作者：
Barker, Chris T.;Lockwood, Jeremy A. F.;Naish, Darren;Brown, Sophie;Hart, Amy;Tulloch, Ethan;Gostling, Neil J.
通讯作者：
Gostling, Neil J.
影响因子：
1.4
作者：
Alonso, Antonio;Ignacio Canudo, Jose
通讯作者：
Ignacio Canudo, Jose
DOI：
10.1016/s0031-0182(99)00167-4
发表时间：
2000-04-01
影响因子：
3
作者：
Benton, MJ;Bouaziz, S;Trueman, C
通讯作者：
Trueman, C
影响因子：
64.8
作者：
Buffetaut, E;Martill, D;Escuillié, F
通讯作者：
Escuillié, F
影响因子：
4.6
作者：
Barker CT;Hone DWE;Naish D;Cau A;Lockwood JAF;Foster B;Clarkin CE;Schneider P;Gostling NJ
通讯作者：
Gostling NJ