New fossil cichlid from the middle Miocene of East Africa revealed as oldest known member of the Oreochromini
New fossil cichlid from the middle Miocene of East Africa revealed as oldest known member of the Oreochromini
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DOI：
10.1038/s41598-019-46392-5
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发表时间：
2019-07
影响因子：
4.6
通讯作者：
Stefanie B. R. Penk;M. Altner;Alexander F. Cerwenka;U. Schliewen;B. Reichenbacher
中科院分区：
文献类型：
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作者：
Stefanie B. R. Penk;M. Altner;Alexander F. Cerwenka;U. Schliewen;B. Reichenbacher
本文记述了东非裂谷中中新世(12.5 Ma)恩哥罗拉鱼类拉格斯特特(图根山)的一新属新种。利用已公布的现存慈鱼的系统发育框架对形态特征进行简约分析，并应用基于形态的综合最佳拟合方法，将新的化石分类群置于非洲慈鱼的系统发育范围内。这些数据表明，这些化石标本可以归入单尾目中的Oreochromini部落。†Oreochroimos kabclenssgen.ET sp.11月显示了一组马赛克字符，与几乎泛非洲的奥雷奥罗米斯和东非湖泊特有的Alcolapia有许多相似之处。由于化石记录中很大程度上看不到今天惊人的多样性，目前有1100个已知物种，这里描述的材料大大增加了我们对该类群中新世多样性的了解。它有效地使化石校准点的年龄翻了一番，到目前为止，在分子系统学研究中，化石校准点一直被用来校准东非慈济鱼的分歧时间。此外，本文所提供的现存慈鱼的比较数据集将为今后的研究提供极大的便利。
A new genus and species of fossil cichlid fishes of middle Miocene age (12.5 Ma) is described from the Ngorora fishLagerstätte(Tugen Hills, Kenya) in the East African Rift Valley. Parsimony analysis of morphological characters using published phylogenetic frameworks for extant cichlids combined with the application of a comprehensive best-fit approach based on morphology was employed to place the new fossil taxon in the phylogenetic context of the African cichlids. The data reveal that the fossil specimens can be assigned to the tribe Oreochromini within the haplotilapiines. †Oreochromimos kabchorensisgen. et sp. nov. shows a mosaic set of characters bearing many similarities to the almost pan-AfricanOreochromisand the East African lake-endemicAlcolapia. As the striking diversity of present-day African cichlids, with 1100 recognised species, has remained largely invisible in the fossil record, the material described here adds significantly to our knowledge of the Miocene diversity of the group. It effectively doubles the age of a fossil calibration point, which has hitherto been used to calibrate divergence times of the East African cichlids in molecular phylogenetic investigations. Furthermore, the comparative dataset derived from extant cichlids presented here will greatly facilitate the classification of fossil cichlids in future studies.