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鄂西下奥陶统分乡组和红花园组产大量的Ｃａｌａｔｈｉｕｍ化石，因其具有下列特征：（１）以锥状或角状、杯状为特征，生长方向为锥端朝下，开口端朝上；（２）具多孔的双层体壁及其间的环形壁间腔；（３）不存在中轴，而具有一开阔的中央腔，其功能大约相当于出水孔；（４）多具发达的根状或瘤状壁外构造，功能为锚固、缠绕或平衡。表明应是一种较低级的滤食性动物，可能与古杯动物有一定亲缘关系，不应将其归属藻类。
The Lower Ordovician sub-village in western Hubei and the Red Garden produce a large number of Calathium fossils because they have the following characteristics: (1) They are characterized by pyramids or horns and cups, with their growth directions being tapered downward, open ends (2) a porous double-walled body wall with an annular wall space therebetween; (3) an absence of a central shaft with an open central cavity that functions approximately as a water outlet opening; (4) Developed root or nubby wall structure, the function of anchoring, winding or balance. That should be a lower level of filter-feeding animals, may have some affinity with ancient beast animals, should not be attributed to algae.