Benthic graptolites (Graptolithina) were surprisingly common and diverse in the Miaolingian (Cambrian), but have rarely been described in detail. Encrusting and erect growing colonies already evolved and can be differentiated in early Miaolingian faunas. The Rhabdopleuridae with their encrusting colonies provide few fossils, but members of the erect growing, bushy colonies of the Dithecodendridae are more common, at least as fragments indicating considerable fragmentation and transport. In the Wuliuan, the benthic graptolites reached a considerable diversity at the genus level with at least 6 genera appearing in this interval. The most common taxon is the encrusting genus Sphenoecium with its robust colonies, showing a worldwide distribution. Most taxa, however, are known from few records and their biostratigraphical and palaeogeographical distribution cannot be established yet. Erroneously, the widely distributed Tarnagraptus with its conical thecae has often been misidentified as the Ordovician Mastigograptus, but differs considerably in its tubarium construction and both might not be closely related.

底栖笔石（Graptolithina）在苗岭纪（寒武纪）中出奇地常见且多样，但很少被详细描述。包壳和直立生长的群体已经进化出来，并且可以在苗岭早期动物群中进行区分。横纹侧耳科及其结壳群落提供的化石很少，但直立生长、浓密的双壳树科群落的成员更为常见，至少作为碎片表明有相当大的破碎和运输。五六湾底栖笔石在属水平上达到了相当的多样性，该区间至少出现了6个属。最常见的分类单元是有壳的海绵属（Sphenoecium）及其强大的菌落，显示出全球分布。然而，大多数类群仅从很少的记录中得知，并且它们的生物地层和古地理分布尚无法确定。错误的是，广泛分布的带有圆锥形卵泡的Tarnagraptus经常被误认为是奥陶纪Mastigograptus，但其管状构造有很大差异，而且两者可能并不密切相关。