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A cryptic record of Burgess Shale-type diversity from the early Cambrian of Baltica
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology. Department of Earth Sciences, University of Cambridge, UK.ORCID iD: 0000-0002-5774-9114
Univ Leicester, Dept Geol, Univ Rd, Leicester LE1 7RH, Leics, England.
Univ Cambridge, Dept Earth Sci, Downing St, Cambridge CB2 3EQ, England.
Univ Cambridge, Dept Earth Sci, Downing St, Cambridge CB2 3EQ, England.
2017 (English)In: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 60, no 1, p. 117-140Article in journal (Refereed) Published
Abstract [en]

Exceptionally preserved ‘Burgess Shale-type’ fossil assemblages from the Cambrian of Laurentia, South China and Australia record a diverse array of non-biomineralizing organisms. During this time, the palaeocontinent Baltica was geographically isolated from these regions, and is conspicuously lacking in terms of comparable accessible early Cambrian Lagerstätten. Here we report a diverse assemblage of small carbonaceous fossils (SCFs) from the early Cambrian (Stage 4) File Haidar Formation of southeast Sweden and surrounding areas of the Baltoscandian Basin, including exceptionally preserved remains of Burgess Shale-type metazoans and other organisms. Recovered SCFs include taxonomically resolvable ecdysozoan elements (priapulid and palaeoscolecid worms), lophotrochozoan elements (annelid chaetae and wiwaxiid sclerites), as well as ‘protoconodonts’, denticulate feeding structures, and a background of filamentous and spheroidal microbes. The annelids, wiwaxiids and priapulids are the first recorded from the Cambrian of Baltica. The File Haidar SCF assemblage is broadly comparable to those recovered from Cambrian basins in Laurentia and South China, though differences at lower taxonomic levels point to possible environmental or palaeogeographical controls on taxon ranges. These data reveal a fundamentally expanded picture of early Cambrian diversity on Baltica, and provide key insights into high-latitude Cambrian faunas and patterns of SCF preservation. We establish three new taxa based on large populations of distinctive SCFs: Baltiscalida njorda gen. et sp. nov. (a priapulid), Baltichaeta jormunganda gen. et sp. nov. (an annelid) and Baltinema rana gen. et sp. nov. (a filamentous problematicum).

Place, publisher, year, edition, pages
Wiley-Blackwell Publishing Inc., 2017. Vol. 60, no 1, p. 117-140
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-319946DOI: 10.1111/pala.12273ISI: 000396894100007OAI: oai:DiVA.org:uu-319946DiVA, id: diva2:1088148
Funder
NERC - the Natural Environment Research CouncilAvailable from: 2017-04-11 Created: 2017-04-11 Last updated: 2017-04-20Bibliographically approved

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