A European giant: a large spinosaurid (Dinosauria: Theropoda) from the Vectis Formation (Wealden Group, Early Cretaceous), UK.
A European giant: a large spinosaurid (Dinosauria: Theropoda) from the Vectis Formation (Wealden Group, Early Cretaceous), UK.
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DOI：
10.7717/peerj.13543
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发表时间：
2022
期刊：
影响因子：
2.7
通讯作者：
Gostling, Neil J.
中科院分区：
文献类型：
--
作者：
Barker, Chris T.;Lockwood, Jeremy A. F.;Naish, Darren;Brown, Sophie;Hart, Amy;Tulloch, Ethan;Gostling, Neil J.
关键词：
在怀特岛西南海岸中国康普顿附近的Vectis组的基底单元（相当于白岩砂岩）中，发现了一种巨大的破伤风兽脚亚目恐龙的后颅部分（颈椎、骶骨和尾椎，以及髂骨、肋骨和肢骨碎片）。这些遗骸似乎属于同一个人，具有与全型棘龙相似的巨大尺寸，超过了先前报道的最大的欧洲兽脚亚目恐龙。一系列特征——包括在前尾椎骨上的棘突带的存在——表明这是棘螈科的一个成员，尽管缺乏令人信服的自同源性阻碍了对一个新分类单元的识别。系统发育分析支持棘龙的亲缘关系，但我们无法确定更精确的分支位置，但在一些数据运行中发现了棘龙科内的位置或早期分化位置的微弱支持。弯曲管形式的生物侵蚀在一些碎片上很明显，可能与鞘翅目生物侵蚀者的收获行为有关。这是第一个从Vectis组报道的棘龙，也是最年轻的英国材料。这种Vectis组棘龙是不寻常的，因为大多数来自威尔登超群下白垩纪单元的恐龙来自下伏巴雷米系威塞克斯组的河流沉积。相比之下，上巴雷米亚组-下阿普提亚组的泻湖相很少有恐龙物质。我们的结论与先前的研究一致，强调西欧是棘龙起源和多样化的关键地区。
Postcranial elements (cervical, sacral and caudal vertebrae, as well as ilium, rib and limb bone fragments) belonging to a gigantic tetanuran theropod were recovered from the basal unit (the White Rock Sandstone equivalent) of the Vectis Formation near Compton Chine, on the southwest coast of the Isle of Wight. These remains appear to pertain to the same individual, with enormous dimensions similar to those of the Spinosaurus holotype and exceeding those of the largest European theropods previously reported. A combination of features—including the presence of spinodiapophyseal webbing on an anterior caudal vertebra—suggest that this is a member of Spinosauridae, though a lack of convincing autapomorphies precludes the identification of a new taxon. Phylogenetic analysis supports spinosaurid affinities but we were unable to determine a more precise position within the clade weak support for a position within Spinosaurinae or an early-diverging position within Spinosauridae were found in some data runs. Bioerosion in the form of curved tubes is evident on several pieces, potentially related to harvesting behaviour by coleopteran bioeroders. This is the first spinosaurid reported from the Vectis Formation and the youngest British material referred to the clade. This Vectis Formation spinosaurid is unusual in that the majority of dinosaurs from the Lower Cretaceous units of the Wealden Supergroup are from the fluviolacustrine deposits of the underlying Barremian Wessex Formation. In contrast, the lagoonal facies of the upper Barremian–lower Aptian Vectis Formation only rarely yield dinosaur material. Our conclusions are in keeping with previous studies that emphasise western Europe as a pivotal region within spinosaurid origination and diversification.
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影响因子：
1.4
作者：
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通讯作者：
Ignacio Canudo, Jose
影响因子：
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作者：
Barker, Chris T.;Naish, Darren;Gostling, Neil J.
通讯作者：
Gostling, Neil J.
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作者：
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作者：
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影响因子：
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作者：
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通讯作者：
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