uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A sclerite-bearing stem group entoproct from the early Cambrian and its implications
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Show others and affiliations
2013 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 3, 1066- p.Article in journal (Refereed) Published
Abstract [en]

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. The entoproct affinity is supported by the sessile body plan and interior soft anatomy. The body consists of an upper calyx and a lower elongate stalk with a distal holdfast. The soft anatomy includes a U-shaped gut with a mouth and aboral anus ringed by retractable marginal tentacles. Cotyledion differs from extant entoprocts in being larger, and having the calyx and the stalk covered by numerous loosely-spaced external sclerites. The description of entoprocts from the Chengjiang biota traces the ancestry of yet another lophotrochozoan phylum back to the Cambrian radiation, and has important implications for the earliest evolution of lophotrochozoans.

Place, publisher, year, edition, pages
2013. Vol. 3, 1066- p.
National Category
Natural Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-194748DOI: 10.1038/srep01066ISI: 000313650900001OAI: oai:DiVA.org:uu-194748DiVA: diva2:606493
Funder
Swedish Research Council, 2012–1658
Available from: 2013-03-13 Created: 2013-02-19 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Exceptionally Preserved Cambrian Lophotrochozoa: Taxonomy, Systematics and Taphonomy of Chengjiang and Indian Springs Lophophorates
Open this publication in new window or tab >>Exceptionally Preserved Cambrian Lophotrochozoa: Taxonomy, Systematics and Taphonomy of Chengjiang and Indian Springs Lophophorates
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The origin and evolution of Lophotrochozoa can be traced to the plethora of lower Cambrian scleritome taxa.  We aim to determine the character suites linking these stem-Lophotrochozoa to their extant crown relatives, in particular the small shelly tommotiids and the stem-group brachiopods. Tracing the origin of morphological characters from these fossils informs the evolution and construction of lophotrochozoan body plans associated with the Cambrian Explosion. This is achieved by comparing records of exceptional preservation, most conspicuously Burgess Shale type Lagerstätten with more widespread Cambrian stem-brachiopods and small shelly fossils with their purported extant relatives, for example. Determining morphological character homologies is crucial to reconstructing the brachiopod stem-group and in polarising character changes associated with the putative transition from scleritome organisms to crown-group brachiopods. In this thesis arguments for a common origin of specific shell structures and exceptionally preserved soft-tissues are investigated. New records of enigmatic stem-group lophotrochozoans are described from two localities, the Indian Springs and Chengjiang Lagerstätte. Comprising the stem-brachiopod Mickwitzia cf. occidens, a putative stem-group entoproct Cotyledion tylodes and an enigmatic agglutinated tubular lophophorate possessing an unusual combination of phoronid, brachiopod and tommotiid characters, Yuganotheca elegans gen. et sp. nov. The interplay of bauplan, microbial activity and environmental factors resulting in such incidences of exceptional soft tissue preservation is also examined critically. Consequently, the evolution of through-gut bearing bilaterians is suggested as the reason for why the Cambrian hosts such a plethora of Lagerstätten. The closure of this taphonomic window is then associated with increased bioturbation following the Cambrian substrate revolution.

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
Keyword
Brachiopoda, Chengjiang, Lagerstätte, Cambrian Explosion, palaeobiology, stem-group, entoproct, phoronid, tommotiid, exceptional preservation.
National Category
Evolutionary Biology Geology Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-216363 (URN)
Presentation
2014-02-19, Geo/Gm116 Norrland II, Geocentrum, Villavägen 16B, Uppsala, 13:15 (English)
Opponent
Supervisors
Funder
Swedish Research Council
Available from: 2014-02-06 Created: 2014-01-21 Last updated: 2014-02-06Bibliographically approved
2. 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

Open Access in DiVA

fulltext(1715 kB)190 downloads
File information
File name FULLTEXT01.pdfFile size 1715 kBChecksum SHA-512
d9965ada8b42bbc0ddf99d842e7bf6b820b122f0269a2baf711ac59b694c15db61f0b5b7b1543a000de4700f78cc1d98db5c47c823acc415c1e99116fd1918c7
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Authority records BETA

Holmer, Lars E.Budd, Graham E.Wang, Haizhou

Search in DiVA

By author/editor
Holmer, Lars E.Budd, Graham E.Wang, Haizhou
By organisation
Palaeobiology
In the same journal
Scientific Reports
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 190 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 425 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf