A new iguanodontian (Dinosauria: Ornithopoda) from the Lower Cretaceous Kitadani Formation of Fukui Prefecture, Japan
A new iguanodontian (Dinosauria: Ornithopoda) from the Lower Cretaceous Kitadani Formation of Fukui Prefecture, Japan
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DOI：
10.1671/0272-4634(2003)23
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发表时间：
2003-04-11
影响因子：
1.4
通讯作者：
Azuma, Y
中科院分区：
文献类型：
--
作者：
Kobayashi, Y;Azuma, Y
本文报道了一种新的禽龙类恐龙--福井龙（Fukuisaurus tetoriensis gen. et sp. nov.）的头骨材料，本文介绍了在日本福井县铁取群早白垩世北谷组河流沉积中发现的一个新的化石。福井龙的某些特徴与禽龙、大浦龙和高尾龙有相似之处，后者被称为禽龙科（Iguanodontidae）。系统发育分析显示，福井龙是一个明确的非鸭嘴龙科禽龙类，并暗示福井龙比禽龙+欧拉龙的分支更衍生，而更接近于高地龙、原翼龙、伊兰比亚、原鸭嘴龙、巴克特龙、端头龙和鸭嘴龙科的分支。这也支持禽龙科是并系的排除高齿禽龙如前所述。福井龙的存在表明该群体在东亚的地理分布更广。来自日本北谷组和其他地层的衍生非鸭嘴龙类禽龙类的出现支持了该组在早白垩世扩散到东亚及其在日本的时间范围扩展。福井龙拥有强大的上颌骨-犁骨关节，表明其拥有独立的非侧动性头骨（在高齿龙、禽龙和鸭嘴龙科中不存在）。
The skull material of a new iguanodontian dinosaur, Fukuisaurus tetoriensis gen. et sp. nov., discovered from the fluvial deposits of the Lower Cretaceous Kitadani Formation, Tetori Group, Fukui Prefecture, Japan, is described here. Some features of Fukuisaurus show affinities with Iguanodon, Ouranosaurus, and Altirhinus, referred to as Iguanodontidae by some. A phylogenetic analysis using mainly cranial characters shows that Fukuisaurus is a definitive derived non-hadrosaurid iguanodontian and implies that Fukuisaurus is more derived than the clade of Iguanodon + Ouranosaurus and more basal to the clade of Altirhinus, Probactrosaurus, Eolambia, Protohadros, Bactrosaurus, Telmatosaurus, and hadrosaurids. It also supports that Iguanodontidae is paraphyletic by the exclusion of Altirhinus as suggested previously. The presence of Fukuisaurus indicates a wider geographical distribution of the group in eastern Asia. The occurrences of derived non-hadrosaurid iguanodontians from the Kitadani Formation and other formations in Japan support a dispersal of this group into eastern Asia by the Early Cretaceous and its temporal range extension in Japan. Fukuisaurus possesses a strong maxilla-vomer articulation, indicative of the independent acquisition of a non-pleurokinetic skull (not present in Hypsilophodon, Iguanodon, and hadrosaurids).