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来自西班牙莫雷利亚早白垩世的一种新的帆背硬棘龙类（恐龙：鸟脚亚目）

A New Sail-Backed Styracosternan (Dinosauria: Ornithopoda) from the Early Cretaceous of Morella, Spain.

作者信息

Gasulla José Miguel, Escaso Fernando, Narváez Iván, Ortega Francisco, Sanz José Luis

机构信息

Unidad de Paleontología, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain.

Grupo de Biología Evolutiva, Universidad Nacional de Educación a Distancia, Madrid, Spain.

出版信息

PLoS One. 2015 Dec 16;10(12):e0144167. doi: 10.1371/journal.pone.0144167. eCollection 2015.

DOI:10.1371/journal.pone.0144167
PMID:26673161
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4691198/
Abstract

A new styracosternan ornithopod genus and species is here described based on a partial postcranial skeleton and an associated dentary tooth of a single specimen from the Arcillas de Morella Formation (Early Cretaceous, late Barremian) at the Morella locality, (Castellón, Spain). Morelladon beltrani gen. et sp. nov. is diagnosed by eight autapomorphic features. The set of autapomorphies includes: very elongated and vertical neural spines of the dorsal vertebrae, midline keel on ventral surface of the second to fourth sacral vertebrae restricted to the anterior half of the centrum, a posterodorsally inclined medial ridge on the postacetabular process of the ilium that meets its dorsal margin and distal end of the straight ischial shaft laterally expanded, among others. Phylogenetic analyses reveal that the new Iberian form is more closely related to its synchronic and sympatric contemporary European taxa Iguanodon bernissartensis and Mantellisaurus atherfieldensis, known from Western Europe, than to other Early Cretaceous Iberian styracosternans (Delapparentia turolensis and Proa valdearinnoensis). The recognition of Morelladon beltrani gen. et sp. nov. indicates that the Iberian Peninsula was home to a highly diverse medium to large bodied styracosternan assemblage during the Early Cretaceous.

摘要

本文基于来自西班牙卡斯特利翁莫雷利亚地区莫雷利亚组（早白垩世，巴列姆阶晚期）单个标本的部分颅后骨骼及一枚关联的齿骨牙齿，描述了一个新的硬棘龙类鸟脚亚目恐龙属种。贝氏莫雷利亚龙（Morelladon beltrani）属种新发现具有八个自近裔性状。这些自近裔性状包括：背椎神经棘非常细长且垂直；第二至第四荐椎腹面的中线龙骨仅限于椎体前半部分；髂骨髋臼后突上有一个向后背侧倾斜的内侧嵴，与背缘相接，坐骨直轴远端横向扩展等。系统发育分析表明，这种新的伊比利亚恐龙形态与其同时期同域分布的欧洲类群——西欧的贝尼萨尔禽龙（Iguanodon bernissartensis）和阿瑟菲尔德曼特尔龙（Mantellisaurus atherfieldensis）的亲缘关系，比与其他早白垩世伊比利亚硬棘龙类（图罗尔德拉帕伦蒂龙（Delapparentia turolensis）和瓦尔代亚里诺原龙（Proa valdearinnoensis））更近。贝氏莫雷利亚龙属种新发现表明，早白垩世时期伊比利亚半岛是一个中型至大型硬棘龙类高度多样化组合的栖息地。

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