凯里动物群有一些分类位置暂不能确定的疑难化石，Ｔｒｉｐｌｅｘａ（ｇｅｎ．ｎｏｖ．）就是其中的一个属，其标本超过３００多件。Ｔｒｉｐｌｅｘａ由左右两瓣壳组成，体小，最大直径仅几毫米，呈扁球形。壳内被两条纵向弧形沟分成轴部及两个侧叶，形同水字形。Ｔｒｉｐｌｅｘａ仅与棘皮动物的某些萼板相似，但Ｔｒｉｐｌｅｘａ个体小，呈小扁球体，壳内部构造三分性极为明显，易于区别。Ｔｒｉｐｌｅｘａ可能是某一门类动物的部件或器官。小而中空的壳体，显示可以漂浮，并非原地埋藏。 Triplexa (gen.nov.) Is one of the most endearing fossils in the Kaili fauna, with more than 300 specimens. Triplexa consists of two shell around the valve, small body, the maximum diameter of only a few millimeters, was flat ball. The shell is divided into two longitudinal arcuate grooves and two lateral lobes, forming the same shape of water. Triplexa is only similar to some echinoderm-like calyx panels, but Triplexa is a small, flattened spheroid that shows the trichotomy in the shell’s interior, making it extremely easy to distinguish. Triplexa may be part of a species of animal or organ. Small and hollow shell, showing that it can float, not buried in situ.