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Mesozoic origin for West Indian insectivores

机译:西印度食虫动物的中生代起源

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The highly endangered solenodons, endemic to Cuba ( Solenodon cubanus) and Hispaniola ( S. paradoxus), comprise the only two surviving species of West Indian insectivores(1,2). Combined gene sequences (13.9 kilobases) from S. paradoxus established that solenodons diverged from other eulipotyphlan insectivores 76 million years ago in the Cretaceous period, which is consistent with vicariance, though also compatible with dispersal. A sequence of 1.6 kilobases of mitochondrial DNA from S. cubanus indicated a deep divergence of 25 million years versus the congeneric S. paradoxus, which is consistent with vicariant origins as tectonic forces separated Cuba and Hispaniola(3,4). Efforts to prevent extinction of the two surviving solenodon species would conserve an entire lineage as old or older than many mammalian orders.
机译:高度濒临灭绝的食肉动物是古巴(Solenodon cubanus)和Hispaniola(S. paradoxus)特有的,是西印度食虫中仅有的两个幸存物种(1,2)。悖论链霉菌的组合基因序列(13.9千碱基)确定,在白垩纪,螺齿目与7600万年前的其他真脂虫食虫不同,这与相符相符,尽管也与分散相符。来自古巴链球菌的线粒体DNA的1.6千碱基序列表明,与同属异形链球菌有2500万年的深度差异,这与从构造力上分离古巴和西班牙裔的维多利亚时代起源是一致的(3,4)。防止这两种幸存的螺牙种类灭绝的努力将保存整个谱系,其年龄要比许多哺乳动物更为古老或古老。

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