Their molecular clock data suggest a much earlier speciation, perhaps prompted by the breakup of the ancient supercontinent of Gondwana around 120 million years ago.
他们的分子钟数据证实更早的时候就出现了物种分化，可能是1亿2千万年前冈瓦纳古陆的破裂引发的。
Hundreds of millions of years ago a humble fish swam in the lakes and rivers of the supercontinent Gondwana.
亿万年前，一条卑微的鱼在冈瓦纳古陆的湖泊和河流中游泳。
The paleogeography was dominated by the supercontinent of Gondwana to the south, the continent of Siberia to the north, and the early formation of the small supercontinent of Euramerica in between.
古地理学认为地球南部主要是冈瓦那大陆，北部是西伯利亚大陆，而早期形成的较小的欧美大陆位于它们之间。
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