A NEW EOCENE LOCALITY IN SOUTHERN FRANCE SHEDS LIGHT ON THE BASAL RADIATION OF PALAEOTHERIIDAE (MAMMALIA, PERISSODACTYLA, EQUOIDEA)
A NEW EOCENE LOCALITY IN SOUTHERN FRANCE SHEDS LIGHT ON THE BASAL RADIATION OF PALAEOTHERIIDAE (MAMMALIA, PERISSODACTYLA, EQUOIDEA)
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DOI：
10.1080/02724634.2012.711404
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发表时间：
2013-01-01
影响因子：
1.4
通讯作者：
Lihoreau, Fabrice
中科院分区：
文献类型：
--
作者：
Danilo, Laure;Remy, Jean A.;Lihoreau, Fabrice
一个新的始新世地点在法国南部已经产生了一个多样化的脊椎动物区系，但包含丰富的材料，代表一个新的物种的早期equoid，Pachynolophus eulaliensis，sp。新物种是古兽科最古老的代表，包括有争议的厚鼻兽。来自单一地点的这分类群的丰富的遗骸允许在这分类群内的高度的未被怀疑的变异性的承认，包括性二型，因此允许讨论通常使用的特征的可靠性。系统发育分析使我们修正了属Pachynolophus的诊断，以及建议排除'Pachynolophus' hookeri属。这项研究提出了新的假设之间的关系基础Equoidea，使我们能够区分两个主要群体（Equidae和Palaeotheriidae）早在始新世，接近的参考水平MP8-9。新的材料似乎是解决有争议的系统学和pachynolophs的系统发生问题的基本基石。这也为欧洲象群初始辐射的时空分布提供了新的认识。
A new Eocene locality in southern France has yielded a poorly diversified vertebrate fauna but does contain abundant material representing a new species of early equoid, Pachynolophus eulaliensis, sp. nov. Biostratigraphic data for this new locality of Sainte-Eulalie suggest a middle Ypresian age. The new species is the oldest representative of the Palaeotheriidae, here including the controversial pachynolophs. The abundant remains of this taxon from a single locality allow the recognition of a high degree of unsuspected variability within this taxon, including sexual dimorphism, thus permitting discussion of the reliability of commonly used characters. A phylogenetic analysis led us to emend the diagnosis of the genus Pachynolophus as well as to suggest the exclusion of 'Pachynolophus' hookeri from the genus. This study proposes new hypotheses of relationships among the basal Equoidea and allows us to distinguish the two main groups (Equidae and Palaeotheriidae) earlier in the Eocene, close to the reference level MP8-9. The new material appears to be a fundamental cornerstone in solving the question of the controversial systematics and phylogeny of pachynolophs. It also sheds new light on the temporal and spatial distribution of the initial radiation of European equoids.