Land snails in mid-Cretaceous Burmese amber (ca. 99–98 Ma) have attracted great interest from paleontologists in recent years. Here we describe a new species of the genus Archaeocyclotus belonging to the family Cyclophoridae, from a well-preserved fossil, using classic light microscopy and modern micro-CT scans with computer 3D reconstructions. The shell of Archaeocyclotus brevivillosus sp. nov. is characterized by short, densely implanted periostracal hairs that emerge at growth line margins from the shell periphery. This new species is the eighth cyclophorid species described from Burmese amber, six of which also have hairy shells. It thus, reinforces the hypothesis that the hairiness is an ancestral state in cyclophorids and that it may have played a role through multiple selective advantages in the terrestrialization of the group during the Mesozoic.

近年来，白垩纪中期缅甸琥珀（约 99-98 Ma）中的蜗牛引起了古生物学家的极大兴趣。在这里，我们使用经典的光学显微镜和带有计算机 3D 重建的现代微 CT 扫描，从保存完好的化石中描述了属于 Cyclophoridae 家族的Archaeocyclotus属的一个新物种。Archaeocyclotus brevivillosus的外壳sp。十一月 其特征是短而密集的层膜毛从壳周边出现在生长线边缘。这个新物种是从缅甸琥珀中描述的第 8 种 cyclophorid 物种，其中 6 种也有毛壳。因此，它强化了这样的假设，即毛羽是环鲶科动物的一种祖先状态，并且它可能通过多种选择优势在中生代群体的陆地化中发挥了作用。