The Lophotrochozoa includes disparate tentacle-bearing sessile protostome animals, which apparently appeared in the Cambrian explosion, but lack an uncontested fossil record. Here we describe abundant well preserved material of Cotyledion tylodes Luo et Hu, 1999, from the Cambrian (Series 2) Chengjiang deposits, reinterpreted here as a stem-group entoproct.… (More)
The morphological disparity of lophotrochozoan phyla makes it difficult to predict the morphology of the last common ancestor. Only fossils of stem groups can help discover the morphological transitions that occurred along the roots of these phyla. Here, we describe a tubular fossil Yuganotheca elegans gen. et sp. nov. from the Cambrian (Stage 3) Chengjiang… (More)
15 The operculum of the problematic tubular fossil Cupitheca holocyclata Bengtson in Bengtson et al. 16 1990 is described for the first time based on collections from South Australia and North China. The 17 phosphatized sub-circular operculum exhibits well defined cardinal processes and a narrow cardinal 18 shield unequivocally demonstrating that Cupitheca… (More)
In the Supplementary Information file originally published with this Article, Pages 3-16 were omitted. These errors have been corrected in the Supplementary Information that now accompanies the Article.