Gymnogeophagus Eocenicus, n. sp (Perciformes: Cichlidae), an Eocene Cichlid from the Lumbrera Formation in Argentina
Gymnogeophagus Eocenicus, n. sp (Perciformes: Cichlidae), an Eocene Cichlid from the Lumbrera Formation in Argentina
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DOI：
10.1080/02724631003618348
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发表时间：
2010-01-01
影响因子：
1.4
通讯作者：
Del Papa, Cecilia
中科院分区：
文献类型：
--
作者：
Malabarba, Maria C.;Malabarba, Luiz R.;Del Papa, Cecilia
本文描述了阿根廷西北部萨尔塔群始新世Lingerra组中的一种新丽鱼，该丽鱼可归属于现存的裸齿丽鱼属。匕首裸食地蟹蟹属Gymnogeophagus eocenicus，n.例如，提出了支持属的突触形态：缺乏上神经元和在第一背棘柄中存在前刺。一个早期至中期始新世年龄的物种呈现synapomorphies和现代属的外观的存在需要接受广泛的分化从基础慈鲷谱系。现存的Gymnogeophagus物种仅限于拉普拉塔流域和巴西南部和乌拉圭的一些沿海流域。始新世化石出现在与该属目前分布相对应的地理区域，表明新热带鱼类区系的分布模式和特有性在该大陆有着非常古老的历史。
A new cichlid referable to the extant genus Gymnogeophagus is described from the Eocene Lumbrera Formation of the Salta Group, northwestern Argentina. dagger Gymnogeophagus eocenicus, n. sp., presents the synapomorphies that support the genus: absence of supraneurals and a presence of a forward spine in the first dorsal pterygiophore. The existence of an early to middle Eocene-aged species presenting the synapomorphies and the appearance of a modern genus requires the acceptance of an extensive differentiation from the basal cichlid lineages. Extant Gymnogeophagus species are restricted to the La Plata drainage and a few coastal drainages of southern Brazil and Uruguay. The occurrence of an Eocene fossil in the geographical area corresponding to the present distribution of the genus suggests the patterns of distribution and endemism of the Neotropical fish fauna have a very old history in the continent.