尾索动物亚门的1纲，全系海洋性浮游动物，身体形状因种类而有不同。体壁最外是被囊层，其内层是外套膜。
但这种富含碳而且容易下沉的海樽纲的发现有可能改变这一假设。
But the discovery of just how carbon-rich and prone to sinking thaliaceans are may change that assumption.
然而，正如勒布拉图先生和琼斯博士在《湖沼学和海洋学》中载文报告，当他们分析海樽纲身体组织时发现，这种动物的碳含量占体重的三分之一。
However, as Mr Lebrato and Dr Jones report in Limnology and Oceanography, when they analysed thaliacean tissues they found that the creatures were one-third carbon by weight.
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