The Triassic fish faunas of the Cuyana Basin, Western Argentina

The Triassic fish faunas of the Cuyana Basin, Western Argentina
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阿根廷西部库亚纳盆地的三叠纪鱼类区系

DOI:
10.1111/j.1475-4983.2010.00931.x
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发表时间:
--
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影响因子:
2.6
通讯作者:
Esperanza:
Esperanza:
中科院分区:
地球科学2区
文献类型:
--
作者:
López-Arbarello;Adriana ; Rauhut;OIliver W. ; Cerdeno;Esperanza:

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阿根廷西部库亚纳盆地的大陆沉积物产生了南美洲最多样化但迄今为止几乎未被研究的三叠纪鱼类动物群。在这里,我们回顾了这些动物群,并表明 29 个命名类群中只有 8 个可以被认为是有效的,包括软骨类 Neochallaia、acrolepid Challaia、Guaymayenia(亲缘关系不确定的分类群)和 perleidiform 科 Pseudobeaconiidae 的 5 个物种。前三个类群很可能来自中三叠世沉积物,而拟信标科则属于晚三叠世。其他材料虽然不是诊断性的,但可能代表其他物种,因此,库亚纳盆地的放线鱼多样性肯定高于目前认识的水平。对于晚三叠世的鱼类区系,值得注意的是冠群新翅目的缺失和肉翅目的单一记录,这可能表明该动物群具有某种程度的特有性,这也得到了高丰度的拟灯鱼科的支持,而这些在其他地区是未知的。此外,根据鱼类表明的年龄和现有的地质信息,我们讨论了靠近门多萨市的 Cerro Bayo 和乌斯帕亚塔的 Agua de la Zorra 组当地动物群的年龄。
The continental deposits of the Cuyana Basin, western Argentina, have yielded the most diverse, but so far almost unstudied, Triassic ichthyofaunas of South America. Here, we review these faunas and show that only eight of the 29 named taxa can be considered valid, including the chondrosteanNeochallaia, the acrolepidChallaia,Guaymayenia, a taxon of uncertain affinities, and five species of the perleidiform family Pseudobeaconiidae. The first three taxa most probably come from Middle Triassic sediments, while the pseudobeaconiids are of Late Triassic age. Other material, although not diagnostic, probably represents other species, and thus, the diversity of actinopterygians in the Cuyana basin is certainly higher than currently recognized. For the Late Triassic fish fauna, the absence of crown‐group neopterygians and a single record of a sarcopterygian is noteworthy and probably indicates some degree of endemism in this fauna, also supported by the high abundance of pseudobeaconiids, which are unknown from other areas. Furthermore, on the basis of the age indicated by the fishes and the available geological information, we discuss the age of the local fauna of the Cerro Bayo, close to the city of Mendoza, and the Agua de la Zorra Formation, Uspallata.
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