Rebekkachromis nov. gen. from the middle–upper Miocene (11 MYA) of Central Kenya: the oldest record of a haplotilapiine cichlid fish

Rebekkachromis nov. gen. from the middle–upper Miocene (11 MYA) of Central Kenya: the oldest record of a haplotilapiine cichlid fish
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来自肯尼亚中部中上新世 (11 MYA) 的 Rebekkachromis nov gen:最古老的 Haplotilapiine 丽鱼科鱼类记录

DOI:
10.1007/s10750-018-3715-8
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发表时间:
--
期刊:
影响因子:
2.6
通讯作者:
Reichenbacher
Reichenbacher
中科院分区:
生物学3区
文献类型:
--
作者:
Kevrekidis;Altner;Reichenbacher

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慈鲷的化石记录很少,每一个新的发现都可以为这个物种淡水鱼家族的进化史提供新的见解。在本文中,我们描述†Rebekkachromisgen。11月,东非裂谷系统中肯尼亚裂谷中新世中晚期(约11mya)。†rebekkachromisi由两个物种代表,它们与所有其他化石和现存的非洲稚鱼不同,除了tetia,它们具有独特的特征组合,即两根神经膜上骨骼和一组位于齿列外的坚固的三尖牙。此外,†rebekkachromisi显示了Haplotilapiini唯一被提出的形态学突触,即在口腔牙齿的内排存在三尖齿。我们发现†rebekkachromisi构成了最古老的单罗非鱼化石记录。中新世中晚期,在肯尼亚中部裂谷的河流和湖泊中,具有三尖齿的慈鲷鱼的进化可能是由火山活动促进的,因为反复的火山灰落下很可能促进了藻类,特别是硅藻的生长。因此,这些鱼类可能有一个主要的优势,因为它们可以利用新的、丰富的食物资源。
The fossil record of cichlids is sparse, and every new discovery can provide new insights into the evolutionary history of this speciose freshwater fish family. In this article, we describe †Rebekkachromisgen. nov. from the middle-to-late Miocene (c. 11 MYA) of the Central Kenya Rift within the East African Rift system. †Rebekkachromisis represented by two species that differ from all other fossil and extant African cichlids, exceptEtia, in possessing the unique character combination of two supraneural bones and a set of robust tricuspid oral teeth in the outer row of the dentition. Furthermore, †Rebekkachromisexhibits the only proposed morphological synapomorphy of the Haplotilapiini, namely the presence of tricuspid teeth in the inner row of the oral dentition. We show that †Rebekkachromisconstitutes the oldest reliably identified fossil record of a haplotilapiine. The evolution of cichlid fishes possessing tricuspid teeth in the rivers and lakes of the Central Kenya Rift during the middle-to-late Miocene could have been facilitated by volcanic activity, as repeated ash falls may well have fostered the growth of algae and in particular diatoms. These fishes could thus have had a major advantage, because they could exploit the newly available, rich food resources.
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