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首页> 外文期刊>Acta Palaeontologica Polonica >The oldest African eucryptodiran turtle from the Cretaceous of Angola
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The oldest African eucryptodiran turtle from the Cretaceous of Angola

机译:来自安哥拉白垩纪的最古老的非洲真金龟

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摘要

A new Late Cretaceous turtle, Angolachelys mbaxi gen. et sp. nov., from the Turonian (90 Mya) of Angola, represents the oldest eucryptodire from Africa. Phylogenetic analysis recovers Angolachelys mbaxi as the sister taxon of Sandownia harrisi from the Aptian of Isle of Wight, England. An unnamed turtle from the Albian Glen Rose Formation of Texas (USA) and the Kimmeridgian turtle Solnhofia parsonsi (Germany), are successively more distant sister taxa. Bootstrap analysis Suggests those four taxa together form a previously unrecognized monophyletic clade of marine turtles, herein named Angolachelonia clade nov., supported by the following synapomorphies: mandibular articulation of quadrate aligned with or posterior to the occiput, and basisphenoid not visible or visibility greatly reduced in ventral view. Basal eucryptodires and angolachelonians originated in the northern hemisphere, thus Angolachelys represents one of the first marine amniote lineages to have invaded the South Atlantic after separation of Africa and South America.
机译:一种新的晚白垩纪海龟,Angolachelys mbaxi gen。等。 11月,来自安哥拉的Turonian(90 Mya),代表了非洲最古老的真密码。系统发育分析从英国怀特岛的Aptian恢复了Angolachelys mbaxi作为Sandownia harrisi的姊妹分类群。来自得克萨斯州的美国Albian Glen Rose岩层的未命名龟和德国的Kimmeridgian龟Solnhofia parsonsi依次是较远的姊妹类群。 Bootstrap分析表明,这四个类群共同构成了先前未被识别的海龟单系进化枝,在这里被称为Angolachelonia cla nov。,由以下同形支持:与下颌骨对齐或在其后方的四边形下颌关节,以及不可见的基底蝶形或可见度大大降低在腹面。基底真足动物和安哥拉人起源于北半球,因此安哥拉奇人是非洲和南美分离后入侵南大西洋的第一批海洋羊膜世系之一。

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