This work shows evidence of complete encapsulated development of Onchidella marginata for the first time in South America. Recent common ancestry was suggested for geographically separated New Zealand sub-Antarctic and South American populations of Onchidella. This could be explained as driven by passive rafting mediated by circumpolar ocean currents. In samples from mussel- and algal-beds in intertidal rocky shores from the southern tip of South America (Tierra del Fuego Island, Argentina) we found both adults and egg masses, and crawling hatchlings were observed.

中文翻译：

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潮间带南美无壳Onchidella marginata的直接发育（Couthouy in Gould，1852年）（Gastropoda：Heterobranchia：Onchidiidae）

这项工作证明了在南美首次完全包封了Onchidella marginata的发育。建议在地理上分开的新西兰亚南极和南美Onchidella种群使用最新的共同血统。这可以解释为是由极地洋流介导的被动漂流驱动的。在来自南美南端（阿根廷火地岛）潮间带多岩石海岸的贻贝和藻类样品中，我们发现成虫和卵团均可见，并观察到爬行的幼体。