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Evolutionary divergence among lineages of the ocean sunfish family, Molidae (Tetraodontiformes)

机译：海洋翻车鱼科（四翅类）的谱系之间的进化差异

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摘要

Ocean sunfish, family Molidae, are enigmatic members of the epipelagic fauna of all tropical and temperate oceans. A study, begun in 1998, initially focused on the population genetics of Mola mola Linnaeus 1758 immediately indicated high levels of genetic divergence in the d-loop and cytochrome b mitochon-drial genes. This preliminary effort was expanded to include Masturus lanceolatus Lienard 1840, Ranzania laevis Pennant 1776, and representative sequences of other Tetraodontiformes. Analysis of the sequence data confirms that there are two species in the genus Mola, Mola mola and M. ramsayi Giglioli 1883, with the latter presumed to be limited to the southern hemisphere. There is an indication of inter-ocean subdivision within both species originating 0.05-0.32 and 1.55-4.10 million years ago, respectively. Given limited sample sizes, however, the divergence estimates are minimums and the isolating mechanisms remain spec- ulative. The systematic analysis provided strong support for the sister taxa relationship between genera Masturus and Mola and the basal position of the genus Ranzania within the family, as well as the sister group relationship of the Tetraodontiform families Tetra-odontidae + Diodontidae to the Molidae.
机译：海洋翻车鱼属于Molidae，是所有热带和温带海洋上层动物区系的神秘成员。一项始于1998年的研究最初关注于Mola mola Linnaeus 1758的种群遗传学，立即表明d环和细胞色素b线粒体基因的高水平遗传差异。这项初步工作已扩展到包括马斯图鲁斯·兰索拉图斯·利纳德（Masturus lanceolatus Lienard）1840，兰赞尼娅·拉维斯·彭南特（Ranzania laevis Pennant）1776，以及其他四齿动物的代表序列。对序列数据的分析证实，Mola属中有两个物种：Mola mola和M. ramsayi Giglioli 1883，据推测后者仅限于南半球。有迹象表明两个物种之间的海洋细分分别起源于0.05-0.32和1.55-410万年前。但是，在有限的样本量的情况下，差异估计是最小值，并且隔离机制仍然是推测性的。系统的分析为马斯杜鲁斯属和莫拉属之间的姐妹类群关系以及兰萨尼亚属在家庭中的基础地位提供了有力的支持，也为四齿齿科四齿齿科+齿齿科与软体动物的姐妹群关系提供了有力支持。

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