An early Cambrian agglutinated tubular lophophorate with brachiopod characters
2014 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 4, 4682- p.Article in journal (Refereed) Published
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 Lagerstätte (Yunnan, China) that exhibits an unusual combination of phoronid, brachiopod and tommotiid (Cambrian problematica) characters, notably a pair of agglutinated valves, enclosing a horseshoe-shaped lophophore, supported by a lower bipartite tubular attachment structure with a long coelomic pedicle providing anchorage. The discovery has important implications for the early evolution of lophotrochozoans, suggesting rooting of brachiopods into the sessile lophotrochozoans and the origination of their bivalved bauplan preceding the biomineralization of shell valves in crown brachiopods.
Place, publisher, year, edition, pages
2014. Vol. 4, 4682- p.
Geology Other Earth and Related Environmental Sciences Evolutionary Biology
Research subject Earth Science with specialization in Historical Geology and Palaeontology
IdentifiersURN: urn:nbn:se:uu:diva-216152DOI: 10.1038/srep04682ISI: 000335885800001OAI: oai:DiVA.org:uu-216152DiVA: diva2:689570
FunderSwedish Research Council, 2009-4395, 2012-1658