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Middle Cambrian Bradoriida (Arthropoda) from the Franconian Forest, Germany, with a review of the bradoriids described from West Gondwana and a revision of material from Baltica
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.ORCID iD: 0000-0001-7790-0478
Bayer Julius Maximilians Univ Wurzburg, Inst Geog & Geol, Lehrstuhl Geodynam & Geomat Forsch, D-97074 Wurzburg, Germany.
2019 (English)In: Palaeontologische Zeitschrift, ISSN 0031-0220, E-ISSN 1867-6812, Vol. 93, no 4, p. 567-591Article, review/survey (Refereed) Published
Abstract [en]

Bradoriid arthropods (class Bradoriida) are described for the first time from the lower-middle Cambrian boundary interval (regional Agdzian Stage) of the Franconian Forest in eastern Bavaria, Germany. The specimens originate from the Tannenknock and Triebenreuth formations, which are part of a shallow marine succession deposited at the margin of West Gondwana. Five different forms have been distinguished, Indiana aff. dermatoides (Walcott), Indiana sp., Indota? sp., Pseudobeyrichona monile sp. nov., and an undetermined svealutid, all of which belong to families that have previously been reported from and are typical of West Gondwana. However, at the generic level, all taxa are new for the region. Indiana is typical of shallow marine environments. So far it has been reported from Laurentia, Avalonia, and Baltica, and is considered to characterize the paleogeographic vicinity of Cambrian continents. Pseudobeyrichona has previously only been recorded from South China, and its new occurrence corroborates previous documentation of taxa from South China in northern West Gondwana. The presence of Indiana as a typical "western" taxon and Pseudobeyrichona among other typical "eastern taxa" confirms the unique biogeographical position of West Gondwana. The poorly known Indiana anderssoni (Wiman) and Indiana minima Wiman from the late early Cambrian of Scandinavia have been restudied in order to re-evaluate the two species and to refine the definition of Indiana. Indiana anderssoni represents a distinct species of Indiana, whereas I. minima is a pseudo-fossil.

Place, publisher, year, edition, pages
2019. Vol. 93, no 4, p. 567-591
Keywords [en]
Cambrian, West Gondwana, Baltica, Bradoriida, Franconian Forest, Indiana, Pseudobeyrichona
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-398131DOI: 10.1007/s12542-019-00448-zISI: 000496332000002OAI: oai:DiVA.org:uu-398131DiVA, id: diva2:1375167
Funder
Swedish Research Council, 621-2015-04726German Research Foundation (DFG), GE 549/22-1Available from: 2019-12-04 Created: 2019-12-04 Last updated: 2019-12-04Bibliographically approved

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