When DNA sequences from Bermuda plants described as Codium isthmocladum ssp. clavatum and a recent collection from Florida originally thought to be C. decorticatum were analyzed, they were found to be a genetic match to the Pacific Mexican species C. simulans. Historical voucher collections assigned to C. isthmocladum ssp. clavatum show that this Pacific lineage has been present in Bermuda (Atlantic) waters for over a century, thus precluding a very recent introduction from the Pacific. We hypothesize that C. simulans may have hitched a ride on the ballast rocks of early commercial ships plying their trade between the Pacific and Atlantic Oceans.

中文翻译：

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DNA 测序和解剖学表明 Pacific Codium simulans 是一种在百慕大和佛罗里达的植物群中发现的遗传可变物种

当来自百慕大植物的 DNA 序列被描述为 Codium isthmocladum ssp。clavatum 和最近从佛罗里达州收集的最初被认为是 C.decorticatum 的标本进行了分析，发现它们与太平洋墨西哥物种 C. simulans 的基因匹配。分配给 C. isthmocladum ssp 的历史凭证集合。clavatum 表明，这个太平洋谱系已经存在于百慕大（大西洋）水域一个多世纪，因此排除了最近从太平洋引入的可能性。我们假设 C. simulans 可能搭上了在太平洋和大西洋之间进行贸易的早期商船的压舱石。