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X-ray microtomography of the tommotiid Micrina reveals cellular and ultrastructural preservation, confirming a tommotiid stem-linguliform affinity
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology. (Brachiopod group)ORCID iD: 0000-0002-1906-0009
The University of Manchester, School of Earth Atmospheric and Environmental Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
The Manchester X-Ray Imaging Facility, School of Materials, The University of Manchester.
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(English)Manuscript (preprint) (Other academic)
National Category
Evolutionary Biology Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-261903OAI: oai:DiVA.org:uu-261903DiVA: diva2:851484
Available from: 2015-09-05 Created: 2015-09-05 Last updated: 2017-01-20
In thesis
1. Decoding the fossil record of early lophophorates: Systematics and phylogeny of problematic Cambrian Lophotrochozoa
Open this publication in new window or tab >>Decoding the fossil record of early lophophorates: Systematics and phylogeny of problematic Cambrian Lophotrochozoa
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
De tidigaste fossila lofoforaterna : Problematiska kambriska lofotrochozoers systematik och fylogeni
Abstract [en]

The evolutionary origins of animal phyla are intimately linked with the Cambrian explosion, a period of radical ecological and evolutionary innovation that begins approximately 540 Mya and continues for some 20 million years, during which most major animal groups appear. Lophotrochozoa, a major group of protostome animals that includes molluscs, annelids and brachiopods, represent a significant component of the oldest known fossil records of biomineralised animals, as disclosed by the enigmatic ‘small shelly fossil’ faunas of the early Cambrian. Determining the affinities of these scleritome taxa is highly informative for examining Cambrian evolutionary patterns, since many are supposed stem-group Lophotrochozoa. The main focus of this thesis pertained to the stem-group of the Brachiopoda, a highly diverse and important clade of suspension feeding animals in the Palaeozoic era, which are still extant but with only with a fraction of past diversity. Major findings include adding support for tommotiid affinity as stem-group lophophorates. Determining morphological character homologies vital to reconstructing the brachiopod stem-group was achieved by comparing Cambrian Lagerstätten with the widespread biomineralised record of Cambrian stem-brachiopods and small shelly fossils. Polarising character changes associated with the putative transition from scleritome organisms to crown-group brachiopods was furthered by the description of an enigmatic agglutinated tubular lophophorate Yuganotheca elegans from the Chengjiang Lagerstätte, China, which possesses an unusual combination of phoronid, brachiopod and tommotiid characters. These efforts were furthered by the use of X-ray tomographic techniques that revealed novel anatomical features, including exceptionally preserved setae in the tommotiid Micrina. The evidence for a common origin of columnar brachiopod shell structures in the tommotiids is suggested and critically examined. Enigmatic and problematic early and middle Cambrian lophotrochozoans are newly described or re-described in light of new evidence, namely: the stem-brachiopod Mickwitzia occidens Walcott from the Indian Springs Lagerstätte, Nevada; a putative stem-group entoproct Cotyledion tylodes Luo and Hu from Chengjiang, China; a new enigmatic family of rhynchonelliform brachiopods exemplified by the newly described Tomteluva perturbata from the Stephen Formation, Canada; and the tommotiid Micrina etheridgei (Tate) from the Flinders Ranges, South Australia. Cladistic analyses of fossil morphological data supports a monophyletic Brachiopoda.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 65 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1284
Keyword
Brachiopoda, Chengjiang, Lagerstätte, Cambrian Explosion, palaeobiology, stem-group, entoproct, phoronid, tommotiid, exceptional preservation
National Category
Other Earth and Related Environmental Sciences Natural Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-261907 (URN)978-91-554-9327-1 (ISBN)
Public defence
2015-10-23, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 13:15 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 621-2008-3768, 621-2011-4961Swedish Research Council, 2009-4395, 2012-1658
Available from: 2015-09-29 Created: 2015-09-05 Last updated: 2017-01-20

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Butler, Aodhán D.Holmer, Lars E.

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