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Oldest glosselline linguliform brachiopod with soft parts from the Lower Cambrian of Yunnan, Southern China
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2014 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 136, no 4, 539-547 p.Article in journal (Refereed) Published
Abstract [en]

Lingulella chengjiangensis Jin, Huo & Wang, 1993 is one of the most abundant brachiopods from the celebrated Lower Cambrian Chengjiang Lagerstätte. A detailed study of abundant new well-preserved specimens clearly shows that their morphology and preserved soft anatomy differ widely from that of the linguliforms of the subfamily Obolinae, including Lingulella. L. chengjiangensis is herein re-described as the probable earliest member of the subfamily Glossellinae, which was previously known only from the Ordovician, and is referred to the new genus Eoglossa. Eoglossa chengjiangensis differs from species of Lingulella in lacking a dorsal pseudointerarea, having an elevated ventral proparea without flexure lines, and in the lack of pitting on the visceral areas of both valves. The detailed study of the exceptionally preserved specimens of E. chengjiangensis also reveals that it bears a unique musculature, which includes a single umbonal scar and a pair of posterolateral scars on each valve. The material of E. chengjiangensis also permits a more detailed study of the pedicle giving further insights into the early diversification and life habit of the linguliform brachiopods.

Place, publisher, year, edition, pages
2014. Vol. 136, no 4, 539-547 p.
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-224525DOI: 10.1080/11035897.2014.914969ISI: 000345381600003OAI: oai:DiVA.org:uu-224525DiVA: diva2:717034
Funder
Swedish Research Council, 2009-4395, 2012-1658
Available from: 2014-05-14 Created: 2014-05-14 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Origin and Lifestyles of early Brachiopods and other Lophotrochozoans: Insights from the Chengjiang and Guanshan Fossil-Lagerstätten
Open this publication in new window or tab >>Origin and Lifestyles of early Brachiopods and other Lophotrochozoans: Insights from the Chengjiang and Guanshan Fossil-Lagerstätten
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One of the great unsolved evolutionary questions concerns the origin and phylogeny of the major animal phyla that appeared in the fossil record more than 540 million years ago, during the Cambrian explosion. Although new molecular information has been very useful, we still have little understanding about the origin of most of the phyla of bilaterians living today. The richly diverse fossil remains from this critical early Cambrian interval are particularly well exposed in China, where exceptionally-preserved fossil lophotrochozoans including brachiopods are particularly abundant. In particular the exceptionally-preserved Cambrian lophophorates from the Chengjiang and Guanshan Lagerstätten have offered new sources of critical palaeobiological data that have been shown to be important for understanding the early ecology and evolution of lophotrochozoans. This thesis comprises a detailed study of new, abundant, exceptionally-preserved material of five lophotrochozoan species from the Chengjiang and Guanshan Lagerstätten. Kuangshanotreta malungensis from Chengjiang is the earliest known example of an attached acrotretoid brachiopod representing the oldest evidence about the palaeoecology of the diverse yet, enigmatic acrotretoid linguliform stock that comprises an important component of the Cambrian evolutionary fauna. Eoglossa chengjiangensis from Chengjiang is the earliest known representative of the Glossellinae. Diandongia pista occurs abundantly both in the Chengjiang fauna and the younger Guanshan fauna, and it’s exceptionally well-preserved and strongly mineralized shells shows that it belongs within the Botsfordiidae. In contrast, the last two species from Chengjiang examined for this thesis - Yuganotheca elegans and Cotyledion tylodes belong within the stem of the Brachiopoda and the Lophotrochozoan entoprocts.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1198
Keyword
Cambrian Explosion, Chengjiang, Guanshan, Lagerstätten, Lophotrochozoa, Brachiopoda
National Category
Geology Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-234843 (URN)978-91-554-9092-8 (ISBN)
Public defence
2014-12-12, Axel Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2014-11-20 Created: 2014-10-24 Last updated: 2015-02-03

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Wang, HaizhouHolmer, Lars Erik

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