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3D imaging of shark egg cases (Palaeoxyris) from Sweden with new insights into Early Jurassic shark ecology
Swedish Museum of Natural History, Department of Paleobiology. Swedish Museum of Natural History. (Vivi Vajda)ORCID iD: 0000-0003-1196-8693
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-1766-3516
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
2021 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 143, no 2-3, p. 229-247Article in journal (Refereed) Published
Abstract [en]

Several shark species produce egg cases as protective casings in which their embryos develop. These casings are composed of multiple layers of collagen and are extremely durable, making them prone to fossilisation. Here we document Palaeoxyris (Spirangium) ‒ fossil shark egg cases from Lower Jurassic successions of southern Sweden. We present high-resolution 3D images of Palaeoxyris based on microfocus X-ray computed tomography (μCT) of seven specimens, including fossils that were embedded within a sandstone matrix. Our examination of the internal structure of the egg cases revealed the possible remnants of a yolk and foetus in one specimen. The cases were most likely produced by hybodont sharks, as outlined in previous studies, and the occurrence of hybodont teeth from Lower Jurassic successions of Sweden support this. Palynological analysis of the matrix from one of the specimens hosting Palaeoxyris, indicates an early Hettangian age. The high percentage of spores (c. 60%) reveals that the egg cases were laid during the Transitional Spore Spike Interval following the end-Triassic mass extinction. The egg cases are found in conjunction with fossil horsetails; with the broader palynological and sedimentological evidence, this suggests an estuarine depositional setting, and potentially indicates that newborn sharks were living in habitats comparable to modern mangroves, as is often the case today.

Place, publisher, year, edition, pages
London: Taylor & Francis, 2021. Vol. 143, no 2-3, p. 229-247
Keywords [en]
Triassic-Jurassic boundary, Spirangium, chondrichthyan, hybodont, X-ray computed tomography
National Category
Geosciences, Multidisciplinary Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4349DOI: 10.1080/11035897.2021.1907442OAI: oai:DiVA.org:nrm-4349DiVA, id: diva2:1614626
Funder
Carl Tryggers foundation , 19:380Swedish Research Council, 2019-4061Swedish Research Council, 2019-04524
Note

Also funded by Stockholms Universitet [SU FV-5.1.2-1035-15]

Available from: 2021-11-26 Created: 2021-11-26 Last updated: 2021-12-08Bibliographically approved

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Publisher's full texthttps://doi.org/10.1080/11035897.2021.1907442

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