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Time for early bilaterians
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics, Systematic Zoology. Systematisk zoologi.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics, Systematic Zoology. Systematisk botanik.
Earth Sciences, Department of Earth Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics, Systematic Zoology.
2007 (English)In: 51st Palaeontological Association Annual Meeting: Programme with Abstracts, 2007, 98- p.Conference paper, Published paper (Other scientific)
Abstract [en]

The emergence of benthic bilaterian animals with mesoderm and frontal concentration of nervous and sensory systems triggered an unparalleled explosion of animal diversity. While several so-called metazoan-wide molecular phylogenetic dating studies have been published over the last few years to try address the timing of this event and its correlation with palaeoclimatological factors, none of these have included members of the worm groups Acoela and Nemertodermatida. These comparatively simple non-segmented worms have recently been shown to represent the oldest known extant bilaterian lineages, branching off before the split between protostomes and deuterostomes. Using ribosomal molecular data from many acoels, nemertodermatids and other metazoans together with age constraints derived from a wide collection of bilaterian and diploblast fossils, we here present age estimates of the deepest splits within Bilateria and compare results inferred from different dating methods and assumptions.

Place, publisher, year, edition, pages
2007. 98- p.
Identifiers
URN: urn:nbn:se:uu:diva-12598OAI: oai:DiVA.org:uu-12598DiVA: diva2:40367
Available from: 2008-05-21 Created: 2008-05-21 Last updated: 2017-01-25

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Wallberg, AndreasAnderson, CajsaBudd, Graham

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