South America is considered a biologically hybrid continent. To the south, the Patagonian region harbours a unique biota strongly related to other southern continents. To the northern portion, tropical and subtropical areas from the Neotropical region show a more complex taxocoenosis related to the Nearctic and Afro‐Oriental regions. The South American Transition Zone (STZ) has been proposed to belong simultaneously to both regions. This work aimed to test the validity of STZ in the light of the distributions of an ancient freshwater taxon.

中文翻译：

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may（E翅目）是否支持南美的生物地理过渡带？

南美被认为是生物混合大陆。在南部，巴塔哥尼亚地区拥有独特的生物区系，与其他南部大陆紧密相关。在北部，新热带地区的热带和亚热带地区表现出与近北地区和非洲东方地区有关的更为复杂的分类学。南美过渡区（STZ）已被提议同时属于两个地区。这项工作旨在根据古代淡水生物群的分布来检验STZ的有效性。