The fossil record of sabre-tooth characins (Teleostei: Characiformes: Cynodontinae), their phylogenetic relationships and palaeobiogeographical implications

The fossil record of sabre-tooth characins (Teleostei: Characiformes: Cynodontinae), their phylogenetic relationships and palaeobiogeographical implications
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剑齿鲨化石记录(Teleostei:Characiformes:Cynodontinae),它们的系统发育关系和古生物地理学意义

DOI:
10.1080/14772019.2022.2070717
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发表时间:
2022
影响因子:
2.6
通讯作者:
Ballen G
Ballen G
中科院分区:
地球科学2区
文献类型:
--
作者:
Ballen G

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犬牙鱼科 (Cynodontidae) 由栖息在南美洲安第斯山脉以东流域的淡水鱼组成。它的化石记录主要是难以识别的孤立牙齿。在这里,我们描述了现存物种Hydrolycus scomberoides的颅骨化石遗骸,以及被鉴定为安第斯山脉以西瓜希拉半岛上新世晚期陶器组的Hydrolycus和cf.Rhaphiodonin沉积物的孤立牙齿。发现了新的、系统发育信息丰富的特征,包括联合齿的数量、主牙插入齿骨的平面、副后牙斑的存在以及齿骨的凹陷和轮廓。我们结合形态学和分子特征(包括现存和灭绝的标本)进行了系统发育分析,产生了一个解析良好的拓扑结构,恢复了Hydrolycus属和Cynodon属之间的新型姐妹群关系,而Rhaphiodon属属于该分支的基础。这与早期恢复Hydrolycus和Rhaphiodonas姐妹类群的研究相矛盾。发现Hydrolycus wallacei的系统发育位置不稳定。 H.的出现瓜希拉上新世晚期的鲭鱼是一个谜团,可以用不同的机制来解释,包括上新世晚期横跨安第斯山脉的持续排水连接,和/或严重干燥和随后灭绝的结果。
The family Cynodontidae is composed of freshwater fishes inhabiting drainages east of the Andes in South America. Its fossil record is mostly represented by isolated teeth that are difficult to identify. Here we describe fossil cranial remains of the extant speciesHydrolycus scomberoidesas well as isolated teeth that were identified asHydrolycusand cf.Rhaphiodonin sediments of the late Pliocene Ware Formation in the Guajira Peninsula, west of the Andes. Novel, phylogenetically informative characters were found including the number of symphysial teeth, the plane of insertion of the leading teeth onto the dentary, the presence of accessory posterior dentigerous patches, and depressions and outline of the dentary. We performed a phylogenetic analysis combining morphological and molecular characters including both extant and extinct specimens, producing a well-resolved topology that recovers a novel sister-group relationship between the generaHydrolycusandCynodon, while the genusRhaphiodonfalls to the base of this clade. This contradicts earlier studies recoveringHydrolycusandRhaphiodonas sister taxa. The phylogenetic position ofHydrolycus wallaceiwas found to be unstable. The occurrence ofH. scomberoidesin the late Pliocene of Guajira is a puzzle that could be explained by different mechanisms, including a persistent drainage connection across the Andes during the late Pliocene, and/or the result of severe drying and subsequent extinction.
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发表时间: 2018
期刊: Smithsonian Contributions to Paleobiology
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DOI: --
发表时间: 2018
期刊: Cladistics
影响因子: 3.6
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发表时间: 2018
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作者:
N. Pérez;M. Parra;C. Jaramillo;D. Silvestro;S. Echeverri;C. Montes;J. Jaramillo;J. Escobar
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新热带鱼类亚科 Cynodontinae(Teleostei:Ostariophys:Characiformes):Cynodon 和 Rhaphiodon 的系统发育研究和修订
DOI: 10.1206/0003-0082(2000)286
发表时间: 2000
影响因子: 2.8
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