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New species of Kuqaia from the Lower Jurassic of Sweden indicates a possible water flea (Crustacea: Branchiopoda) affinity
Swedish Museum of Natural History, Department of Paleobiology. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-1766-3516
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-6723-239X
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-2987-5559
2023 (English)In: PLOS ONE, E-ISSN 1932-6203, Vol. 18, no 6, article id e0282247Article in journal (Refereed) Published
Abstract [en]

The enigmatic acid-resistant mesofossil genus Kuqaia isemended, anew species (Kuqaia scanicus) isinstituted, and three established species are described from the Lower Jurassic (lower Pliensbachian) ofthe Ka ̈ vlinge BH-928 core, insouthern Sweden. Kuqaia has adistribution across the middle northern latitudes ofPangaea and isrestricted toLower tolower Middle Jurassic strata. Morphological characters support Kuqaia being the ephippia (resting egg/embryo cases) ofCladocera (Crustacea: Branchiopoda), and aprobable early stemgroup taxon ofthe Daphnia lineage. The paleoecology ofthe small planktonic crustaceans indicate purely fresh-water environments, such as lakes orponds, all occurrences being in continental deposits, and the Kuqaia specimens possibly represent dry-season resting eggs. Chemical analyses ofthese and similar fossils, and ofextant invertebrate eggs and egg cases are recommended toimprove resolution ofthe biological affiliations ofsuch mesofossil groups.

Place, publisher, year, edition, pages
Public Library of Science (PLoS), 2023. Vol. 18, no 6, article id e0282247
Keywords [en]
Jurassic, Branchiopoda, Crustacea
National Category
Evolutionary Biology Other Earth and Related Environmental Sciences
Research subject
Diversity of life; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-5289DOI: 10.1371/journal.pone.0282247OAI: oai:DiVA.org:nrm-5289DiVA, id: diva2:1792200
Funder
The Royal Swedish Academy of Sciences, GS2021-0018Swedish Research Council, 2019-4061Swedish Research Council, 2018-04527Swedish Research Council, 2019-04524Knut and Alice Wallenberg Foundation, KAW 2020.0145Carl Tryggers foundation , 19:380Available from: 2023-08-28 Created: 2023-08-28 Last updated: 2023-12-06Bibliographically approved

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Peng, JungangSlater, Sam MMcLoughlin, StephenVajda, Vivi
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