The common ancestor of introverts may has a retractable proboscis 早期翻吻动物的祖先可能具有可伸缩的吻部。
2.
Of which 4 new genera and 4 new species are established . discovery of a lot of fossil worms with their traces provide direct clues to study on the locomotion style of the worm and indirect evidences for trace fossils to find their producer 在以上属种中发现大量的虫、迹同在的化石，为研究早寒武世的翻吻动物的运动方式以及遗迹化石提供了直接依据。
